Treatment of skin, including aging skin, to improve appearance

ABSTRACT

The present invention generally relates to compositions and methods for topical or transdermal delivery, treatment of skin, and improving the appearance of skin, e.g., medically or cosmetically. In some cases, the composition may include nitric oxide and/or peptides such as thyrotropin-releasing hormone (TRH) and/or GnRH (gonadotropin-releasing hormone). The nitric oxide and/or peptide may be present within a first phase comprising a lecithin, such as phosphatidylcholine. In certain embodiments, the lecithin is present in liposomes, micelles, or other structures containing nitric oxide, peptides, or both. The composition can take the form of a gel, a cream, a lotion, an ointment, a solution, a solid “stick,” etc., that can be rubbed or sprayed onto the skin. Other aspects of the present invention are generally directed to methods of making or using such compositions, methods of promoting such compositions, kits including such compositions, or the like.

RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent applicationSer. No. 13/801,446, filed Mar. 13, 2013, entitled “Treatment of Skin,Including Aging Skin, to Improve Appearance,” by Perricone. Thisapplication is also a continuation-in-part of U.S. patent applicationSer. No. 13/801,402, filed Mar. 13, 2013, entitled “Systems and Methodsfor Delivery of Peptides,” by Perricone. Each of these is incorporatedherein by reference in its entirety.

FIELD

The present invention generally relates to compositions and methods fortransdermal or topical delivery, including topical or transdermaldelivery of drugs in the treatment of skin.

BACKGROUND

Topical drug delivery systems are known. These systems deliver drugs orother therapeutic agents, or other desired substances topically ortransdermally, and may be designed to act locally at the point ofapplication, or to act systemically once entering the body's bloodcirculation. In these systems, delivery may be achieved by techniquessuch as direct topical application of a substance or drug in the form ofan ointment or the like, or by adhesion of a patch with a reservoir orthe like that holds the drug (or other substance) and releases it to theskin in a time-controlled fashion.

Topical delivery systems for substances such as peptides, drugs, painrelieving compounds, vitamins, and skin improving compounds have been inuse for a number of years. Transdermal delivery systems using creamshave been developed for use with analgesics and skin refining compounds.However, these delivery systems do not work effectively for allcompounds. In particular, topical or transdermal delivery systems forthe treatment of skin are needed.

SUMMARY

The present invention generally relates to compositions and methods fortopical or transdermal delivery, including treatment of skin, skinconditions, and aging skin, in some aspects to improve the appearance ofthe skin. The subject matter of the present invention involves, in somecases, interrelated products, alternative solutions to a particularproblem, and/or a plurality of different uses of one or more systemsand/or articles.

In one aspect, the present invention is generally directed to a methodof improving skin appearance. According to one set of embodiments, themethod comprises administering, to the skin of a subject, a compositioncomprising an effective amount of thyrotropin-releasing hormone (TRH)and/or gonadotropin-releasing hormone (GnRH) and nitric oxide to improveskin appearance, and a carrier having a phosphatidylcholine componententrapping the nitric oxide.

The method, in another set of embodiments, includes an act ofadministering, to the skin of a subject, a composition comprising aneffective amount of nitric oxide to improve skin appearance, and acarrier having a phosphatidylcholine component entrapping the nitricoxide.

In yet another set of embodiments, the method comprises an act ofcontacting the skin of a subject with a composition comprising anemulsion comprising a first phase comprising TRH and/or GnRH, nitricoxide and lecithin, and a second phase comprising an emulsifier. In somecases, the lecithin is present at least about 0.25% by weight of thecomposition. In certain embodiments, the first phase comprises no morethan about 250 ppm of water by weight of the composition.

The method, in still another set of embodiments, comprises contactingthe skin of a subject with a composition comprising an emulsioncomprising a first phase comprising nitric oxide and lecithin, and asecond phase comprising an emulsifier. In some embodiments, the lecithinis present at least about 0.25% by weight of the composition. In somecases, the first phase comprises no more than about 250 ppm of water byweight of the composition.

In yet another set of embodiments, the method includes an act ofadministering, topically to the skin of a subject, a compositioncomprising an effective amount of thyrotropin-releasing hormone (TRH)and/or gonadotropin-releasing hormone (GnRH) to improve skin appearance.In still another set of embodiments, the method includes an act ofadministering, to the skin of a subject, a composition comprising aneffective amount of thyrotropin-releasing hormone (TRH) and/orgonadotropin-releasing hormone (GnRH), and nitric oxide to improve skinappearance, and a carrier having a phosphatidylcholine componententrapping the nitric oxide.

In another aspect, the present invention encompasses methods of makingone or more of the embodiments described herein, for example, acomposition comprising nitric oxide. In still another aspect, thepresent invention encompasses methods of using one or more of theembodiments described herein, for example, a composition comprisingnitric oxide.

Other advantages and novel features of the present invention will becomeapparent from the following detailed description of various non-limitingembodiments of the invention. In cases where the present specificationand a document incorporated by reference include conflicting and/orinconsistent disclosure, the present specification shall control. If twoor more documents incorporated by reference include conflicting and/orinconsistent disclosure with respect to each other, then the documenthaving the later effective date shall control.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 shows results from the laser Doppler assay in four human studyparticipants.

DETAILED DESCRIPTION

The present invention generally relates to compositions and methods fortopical or transdermal delivery, treatment of skin, and improving theappearance of skin, e.g., medically or cosmetically. In some cases, thecomposition may include nitric oxide and/or peptides such asthyrotropin-releasing hormone (TRH) and/or GnRH (gonadotropin-releasinghormone). The nitric oxide and/or peptide may be present within a firstphase comprising a lecithin, such as phosphatidylcholine. In certainembodiments, the lecithin is present in liposomes, micelles, or otherstructures containing nitric oxide, peptides, or both. The compositioncan take the form of a gel, a cream, a lotion, an ointment, a solution,a solid “stick,” etc., that can be rubbed or sprayed onto the skin.Other aspects of the present invention are generally directed to methodsof making or using such compositions, methods of promoting suchcompositions, kits including such compositions, or the like.

According to one aspect of the present invention, a composition asdescribed herein is used to treat skin. Thus, in one set of embodiments,the application of nitric oxide and/or peptide, e.g., in a nitric oxideand/or peptide matrix, to the skin of a subject may result in clinicaland/or cosmetic improvement. In some cases, the delivery of nitric oxideand/or peptides to the skin, e.g., to the epidermis and/or dermis, maybe achieved at a controlled rate and/or concentration. Without wishingto be bound by any theory, it is believed that nitric oxide may increasevasodilation, and/or promote beneficial neural signaling.

In another embodiment, compositions comprising nitric oxide, asdescribed herein, further comprise a peptide. In some aspects,compositions comprising peptides provided herein are effective intreating skin, skin conditions, and/or aging skin, and for improving theappearance of skin, alone or in combination, e.g., in a commoncomposition with, nitric oxide. In some cases, the peptide may includetwo or more amino acids linked by the carboxyl group of one amino acidto the amino group of another, e.g. a peptide linkage, to form an aminoacid sequence. It is contemplated that peptides may be purified and/orisolated from natural sources or prepared by recombinant or syntheticmethods. Amino acid sequences may be encoded by naturally ornon-naturally occurring nucleic acid sequences or synthesized byrecombinant nucleic acid sequences or artificially synthesized. Apeptide may be a linear peptide or a cyclopeptide, e.g. cyclic includingbicyclic. In some cases, a “peptide” may be interchangeably referred toas a “therapeutic peptide.” In some cases, the peptide is a“pseudo-peptide” or a “peptidomimetic,” which are compounds designed tofunctionally mimic a peptide. Non-limiting examples of peptides includethyrotropin-releasing hormone (TRH), melanocyte-stimulating hormone(MSH), or gonadotropin-releasing hormone (GnRH).

In certain embodiments, the composition comprises nitric oxide and/orthe peptide thyrotropin-releasing hormone (TRH), or an analog thereof.Non-limiting examples of TRH or TRH analogs contemplated by the presentdisclosure include protirelin (Thyrel TRH, Relafect TRH), taltirelin(Ceredist), montirelin, as well as salts and analogs of any of theforegoing. TRH is believed to be a potent stimulator of mitochondrialactivity and biogenesis in human epidermal keratinocytes. For example,TRH may stimulate the transcription of several key genes ofmitochondrial biogenesis (including the master regulator ofmitochondrial biogenesis), resulting in increased mitochondrial complexI and IV enzyme activity and enhanced oxygen consumption. Thus, withoutwishing to be bound by any theory, compositions comprising TRH asdescribed herein may be used to treat skin, e.g., aging skin, or improvethe appearance of skin, by beneficially increasing mitochondrialbiogenesis in skin cells (e.g., keratinocytes), which is important formediating skin cell functions requiring enhanced energy demand, e.g.,skin cell growth, repair, and regeneration. For example, certaincompositions as described herein may be used to treat aging skin and/orimprove the appearance of skin, e.g., by reducing or preventingwrinkles, and/or increasing skin elasticity and firmness, as a result ofpromoting mitochondrial biogenesis in skin cells, which may allow forincreased skin cell growth, repair, and/or regeneration.

Without wishing to be bound by any theory, it is also believed that TRHis involved in energy metabolism. TRH also has been implicated as astimulator of hair follicle growth in human skin. TRH may also beinvolved in mitochondrial activity and metabolic capacity in the skin.For example, the application of TRH to the skin, e.g., usingcompositions as discussed herein, may be used to modulate mitochondrialactivity or metabolic capacity in skin cells, which may lead topreventing or reversing skin aging or skin appearance. This may beachieved, for instance, by improving the function of mitochondria inskin cells. Improvement in mitochondria function can be determined, forexample, by analysis of genes within the mitochondria, e.g., bysynthesis of mitochondrial DNA, the number or density of mitochondria inskin cells, the amount of oxygen consumption, the activation ofmitochondrial genes within skin cells (e.g., respiratory genes), or thelike. In one set of embodiments, a composition as described herein(e.g., containing TRH), may be applied to the skin of a subject toimprove the appearance of the skin, to reverse aging or wrinkles, toimprove skin tone, to increase expression of MTCO1(mitochondria-selective subunit I of respiratory chain complex IV, whichis part of the mitochondrial respiration), to cause or improveproduction of hair within the skin, etc. As mentioned, TRH can bereadily obtained from commercial sources. As is known by those ofordinary skill in the art, TRH has the structure pyroGlu-His-Pro-NH₂ or:

In another set of embodiments, the composition comprises nitric oxideand/or gonadotropin-releasing hormone (GnRH), or an analog thereof. Thecomposition may also comprise other peptides, such as MSH or TRH, or anyother peptide described herein, in some embodiments. GnRH is also knownas also known as luteinizing-hormone-releasing hormone (LHRH) orluliberin. As is known to those of ordinary skill in the art, GnRH hasthe structure pyroGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH₂ (SEQ IDNO: 1), and GnRH and its analogs can be readily obtained from commercialsources. Non-limiting examples of GnRH or GnRH analogs includegonadorelin hydrochloride (Factrel®), gonadorelin diacetate tetrahydrate(Cystorelin®), leuprolide, leuprolide acetate, deslorelin as well assalts and analogs of any of the foregoing.

GnRH is a trophic peptide hormone that has multiple effects, includingrelease of follicle-stimulating hormone (FSH) and luteinizing hormone(LH) from the anterior pituitary. It is typically produced and releasedendogenously from neurons within the hypothalamus. It may also have arole in aging. For example, suppression of GnRH may promote aging, e.g.,by inhibiting adult neurogenesis, potentially leading to a number ofaging-related effects such as muscle weakness, cognitive decline, lossof skin tension or appearance, etc., and the application of GnRH mayresult in muscle strength, an increase in bone density, an increase incognitive ability, an increase in skin tension, a decrease in wrinkles,etc. GnRH may also have an effect on mitochondrial activity in somecells, for example, increasing GnRH exposure may include the number ofmitochondria in cells and/or the activity level of the mitochondria.

Accordingly, without wishing to be bound by any theory, it is believedthat the application of GnRH, e.g., within a composition as discussedherein, may be used to treat a person, medically or cosmetically, for avariety of age-related conditions, including muscle weakness, cognitivedecline, loss of skin tension or appearance, etc. For example, acomposition as discussed herein may be applied to the skin of a subject,e.g., wrinkled skin, which may lead to a decrease in the wrinkling ofthe skin and/or an increase in skin tension. The application of GnRH mayalso result in muscle strength, an increase in bone density, an increasein cognitive ability, an increase in skin tension, a decrease inwrinkles, etc. In some cases, one or more than one of these effects maybe present.

In one set of embodiments, compositions of the present invention may beused to facilitate the transport of GnRH (and/or other peptides such asis discussed herein) across the blood-brain barrier into the brain,e.g., into the hypothalamus, and/or to other areas of the brain. Withoutwishing to be bound by any theory, it is believed that in someembodiments, the application of compositions comprising GnRH (and/orother peptides) to the skin, e.g., in a cream or other formulationcomprising NO, nitric oxide, causes the GnRH and the NO to enter thebloodstream, and the presence of NO may facilitate the transport of GnRH(and/or other peptides) across the blood-brain barrier. Accordingly,certain embodiments of the invention are directed to compositionscomprising GnRH and NO, e.g., along with a carrier having aphosphatidylcholine component entrapping the nitric oxide, as discussedherein. However, as discussed herein, in some cases, the compositiondoes not necessarily include NO.

In addition, in some embodiments, the composition may include both GnRHand TRH. Without wishing to be bound by any theory, it is believed thatthe combination of GnRH and TRH may have surprising and synergisticeffects in some cases. For example, both TRH and GnRH have effects onmitochondrial and metabolic activity within the body, and stimulation ofmitochondria by both TRH and GnRH may result in dramatic increases inthe number of mitochondria in cells and/or the activity level of themitochondria, compared to only TRH or only GnRH. In addition, TRH andGnRH may act on different systems within the body; for example, GnRH mayact to increase muscle mass or bone density, while TRH may act on otherorgans such as the pancreas or the gonads. In addition, in someembodiments, the composition may further include nitric oxide and/orother peptides, e.g., as discussed herein.

Other peptides contemplated by the present invention (e.g., for use innitric oxide containing compositions) include, but are not limited to,copper-peptides (e.g., the tripeptide GHK-Cu), collagen,glycosaminoglycans, melanocyte-stimulating hormone (e.g., α-MSH), andmelatonin and/or derivatives or analogs of any of the foregoing. In someaspects, compositions such as those described herein may furthercomprise agents beneficial in the treatment of skin, or useful forimproving the appearance of skin, including, but not limited to,retinol, alpha-hydroxy acids (AHAs), hyaluronic acid, and antioxidants(e.g., Vitamins A, C, and E, Coenzyme Q-10, alpha lipoic acid, etc.).

In some aspects, it is contemplated that nitric oxide provides additive,or synergistic effects, when combined with TRH and/or GnRH in certaincompositions, e.g., those described herein. For example, without wishingto be bound by any theory, nitric oxide acting as a vasodilator,improves the circulation, availability, and/or the delivery of TRHand/or GnRH, e.g., when compositions such as those described herein areadministered to a subject, e.g., a subject having a skin condition,and/or aging skin, and/or a subject desiring improvement in skinappearance.

In one set of embodiments, application of nitric oxide and/or peptides,e.g., in a penetrating matrix gel to deliver the active nitric oxideand/or peptide, may be applied to the skin of a subject, e.g., asdescribed herein. The composition may include any one or more of thepeptides described herein, with or without nitric oxide. Additionally,in some embodiments, the composition may be applied in conjunction withother types of treatments to a subject, e.g., to the skin of a subject,as described herein. These may be occur, e.g., simultaneously orsequentially, in various embodiments.

In some cases, the compositions and methods described herein are used tostimulate the absorption of nitric oxide and/or peptides into cells andtissues, and/or promote vasodilation of skin tissues. Certain aspects ofthe present invention thus permit treatment or prevention of varioussymptoms such as wrinkles, decreased volume and elasticity, sagging,erythema/telangiectasia (redness), dyspigmentation (browndiscoloration), solar elastosis (yellowing), keratoses (abnormalgrowths) and poor texture. In some aspects, treatment or prevention ofthese symptoms improves the appearance of the skin. In some aspects,improvement in symptoms and/or appearance of the skin is monitored bye.g., taking periodic photos of the skin as it is treated over time, useof a haptic sensor for monitoring skin conditions over time, and/orassessment of clinical parameters as determined by a dermatologist.

In one aspect, the present invention is directed to treating skin, skinconditions, and/or aging skin. In some aspects, the present invention isdirected to improving skin appearance. For example, a composition suchas described herein can be applied to the skin of a subject on or nearareas in which an improvement in skin appearance is desirable, e.g., theface, or portions thereof, e.g., near or around the eyes and/or mouth,or the arms, legs, back, stomach, etc. In some aspects, the presentinvention is directed to reducing or preventing the appearance of skinwrinkles, which in some aspects is desirable and improves the appearanceof the skin. In some aspects, the present invention is directed toimproving the appearance of skin that has been damaged due to exposureto ultraviolet light, e.g., sunburned skin. In yet another aspect, thepresent invention is directed to improving the appearance of aging skin,e.g., by reducing or preventing the appearance of wrinkles and/orimproving the elasticity of the aging skin.

Without wishing to be bound by any theory, it is believed that theeffects of nitric oxide (e.g., vasodilation) allows for the improvementin skin appearance by promoting increased blood flow to the skin, e.g.,when a composition such as described herein is applied to the skin. Forexample, when applied to the skin, certain compositions of the presentinvention increases blood flow in that or adjacent areas of the skin,which increases the amount of nutrients and oxygen flowing to the skin,and/or increases the removal of cellular waste products, which therebyresults in healthier skin, which in some aspects improves the appearanceof the skin. For example, nitric oxide may be introduced to subjects tostimulate or support vasodilatation, anti-inflammation, anti-bacteria,etc. In addition, as discussed herein, there may be additive orsynergistic effects with the addition of one or more peptides, includingGnRH, TRH, other peptides discussed herein, etc.

In another aspect, certain compositions are used to treathyperproliferative skin conditions, e.g., psoriasis, atopic dermatitis,eczematous dermatitis, dermatitis, eczema, contact dermatitis, erythemamultiforme, pruritus (urticaria), as the nitric oxide biosyntheticpathway has been shown, e.g., to be involved in arresting cellproliferation and initiating the switch to terminal differentiation incertain cells. Thus in some aspects, without wishing to be bound bytheory, certain compositions of the present invention comprising nitricoxide and/or peptides are used to treat hyperproliferative skinconditions, e.g., psoriasis, by reducing the amount of proliferationand/or increasing the amount of keratinocyte differentiation. In someaspects, such treatment improves the appearance of the skin.

In certain embodiments of the present invention, nitric oxide gas itselfis entrapped or contained within various compositions as discussedherein, for example, in liquid crystal multilamellarphosphatidylcholine. In addition, in certain embodiments as discussedbelow, the composition may be stable and can be stored for periods oftime with little or no loss or reaction of the nitric oxide containedtherein.

In some embodiments, the nitric oxide and/or a peptide within thecomposition is stable at room temperature, and may remain active forextended periods of time, for example, for at least 1 year, at least 1.5years, at least 2 years, at least 2.5 years, at least 3 years, at least4 years, etc. The nitric oxide and the peptide may be released, forexample, when the composition is exposed to an aqueous environment,e.g., within the body. Without wishing to be bound by any theory, it isbelieved that when the composition is applied to the skin, the liquidcrystal structure collapses, delivering nitric oxide and/or the peptidesto, e.g., a muscle or other desired area of treatment. The concentrationof the nitric oxide and the peptide inside the liquid crystal matrix canbe varied in terms of concentration. The matrix also may act as asustained release and delivery system in some embodiments. It is alsobelieved that the liquid crystal is highly penetrating, such that nitricoxide and the peptide can be delivered to the epidermis, dermis anddermal vascular for systemic release as well as to subcutaneous fat, atleast under some conditions.

Since nitric oxide is an unstable and reactive gas, entrapment, storage,and release of nitric oxide requires careful formulation in someembodiments of the invention. For example, nitric oxide readily reactswith water to form nitrous acid (HNO₂), and thus, certain embodiments ofthe invention include compositions or phases that are substantially freeof water. As another example, in one set of embodiments, nitric oxidemay be contained within a first phase comprising a lecithin such asphosphatidylcholine, which may be present within a second phasecomprising an emulsifier, such as is discussed herein. Other components,for example, transdermal penetration enhancers, adjuvants, surfactants,lubricants, etc. can also be present in certain cases.

Thus, the compositions of the invention comprise, in certain aspects, aphase comprising phosphatidylcholine and/or other lecithins in whichnitric oxide, and in some aspects peptide, is contained within or“trapped.” The phosphatidylcholine or lecithin may be contained within asecond phase, for example, comprising an emulsifier, which may cause thephosphatidylcholine or lecithin to form vesicles, e.g., micelles orliposomes. The phosphatidylcholine or lecithin composition can beunilamellar or multilamellar in some embodiments. In some instances, thepresence of the second phase causes the phosphatidylcholine or lecithinto form a liquid crystal arrangement.

The nitric oxide is typically gaseous, and may be present within thecomposition as small bubbles and/or bound to lecithins orphosphatidylcholines within the composition. For example, the nitricoxide may be bound to double bonds present in the lecithins orphosphatidylcholines. Phosphatidylcholine is believed to stabilizeand/or contain the nitric oxide. In some cases, stability of thecomposition can be achieved at room temperature (about 25° C.), and/orat other temperatures such as those described herein. Without wishing tobe bound by any theory, it is believed that the phosphatidylcholineadopts a liquid crystal structure under such conditions, which canthereby contain the nitric oxide, e.g., as small gaseous bubbles, and/orthrough binding with lecithins or phosphatidylcholines. Similarly(without wishing to be bound by any theory), it is contemplated thatpeptides are also contained within the vesicular and/or liquid crystalstructure of phosphatidylcholine or other carriers described herein. Insome aspects, (without wishing to be bound by any theory) the peptide,depending on its hydrophobicity, may be contained withinphosphatidylcholine vesicular membrane, or may be tightly associatedwith the inner or outer surface of the membrane.

Nitric oxide is typically reactive with water (e.g., forming nitrousacid), which contributes to its relatively short lifetime within thebody or within other aqueous environments. Accordingly, in certainembodiments of the invention, the composition, or at least a phase ofthe composition comprising the nitric oxide (and/or the second phase,and/or one or more materials used to prepare a nitric oxide composition,and/or a nitric oxide composition prepared as described herein), issubstantially free of water, e.g., comprising no more than about 10 wt%, no more than about 3 wt %, no more than about 1 wt %, no more thanabout 0.3 wt %, or no more than about 0.1 wt % water (i.e., relative tothe weight of the overall composition). The composition may also have nomore than about 1,000 ppm, no more than about 750 ppm, no more thanabout 500 ppm, no more than about 400 ppm, no more than about 300 ppm,no more than about 250 ppm, no more than about 200 ppm, no more thanabout 150 ppm, no more than about 100 ppm, no more than about 50 ppm, nomore than about 25 ppm, or no more than about 10 ppm of water. Incertain embodiments, no detectable water may be present in thecomposition, or at least within a phase of the composition comprisingthe nitric oxide. Any suitable technique can be used for determining theamount of water present in the composition, for example, Karl-Fishertitration. In some cases, the composition may also be free of anyliquids that typically contain water, e.g., physiological buffers, bodyfluids, saline, or the like.

Any suitable amount of nitric oxide may be present within a compositionprepared as described herein. For example, at least about 0.3 wt %, atleast about 0.5 wt %, at least about 0.7 wt %, at least about 1 wt %, atleast about 1.5 wt %, at least about 2 wt %, at least about 2.5 wt %, atleast about 3 wt %, at least about 5 wt % at least about 10 wt %, atleast about 20 wt %, at least about 30 wt %, at least about 40 wt %, atleast about 50 wt %, at least about 60 wt %, at least about 70 wt %, atleast about 80 wt %, at least about 90 wt %, at least about 100 wt %, atleast about 110 wt %, or at least about 120 wt % of the composition canbe nitric oxide, where the basis of the weight percentage is the weightof the composition before nitric oxide is added. Combinations of any ofthese are also possible. For example, the nitric oxide may be present atbetween 70 wt % and about 120 wt % of the composition.

In some embodiments, the nitric oxide may be present at a concentrationof at least about 400 mg/kg, at least about 450 mg/kg, at least about500 mg/kg, at least about 550 mg/kg, at least about 570 mg/kg, at leastabout 600 mg/kg, at least about 650 mg/kg, at least about 700 mg/kg, atleast about 750 mg/kg, at least about 800 mg/kg, at least about 850mg/kg, at least about 950 mg/kg, or at least about 1000 mg/kg of thecomposition. In certain cases, the nitric oxide may be present at aconcentration of no more than about 2000 mg/kg, no more than about 1500mg/kg, no more than about 1000 mg/kg, no more than about 960 mg/kg, nomore than about 900 mg/kg, no more than about 800 mg/kg, no more thanabout 700 mg/kg, or no more than about 600 mg/kg. Combinations of any ofthese are also possible. For example, the nitric oxide may be present ata concentration of between about 570 mg/kg and about 960 mg/kg.

In some embodiments, the nitric oxide is present at a concentration(e.g., on a per-mass basis) of at least about 100 ppm, at least about200 ppm, at least about 300 ppm, at least about 400 ppm, at least about500 ppm, at least about 600 ppm, at least about 700 ppm, at least about800 ppm, at least about 900 ppm, at least about 1000 ppm, at least about1100 ppm, at least about 1200 ppm, at least about 1300 ppm, at leastabout 1400 ppm, at least about 1500 ppm, at least about 1600 ppm, atleast about 1700 ppm, at least about 1800 ppm, at least about 1900 ppm,at least about 2000 ppm, at least about 2500 ppm, at least about 3000ppm, at least about 3500 ppm, at least about 4000 ppm, at least about4500 ppm, at least about 5000 ppm, at least about 6000 ppm, at leastabout 7000 ppm, at least about 8000 ppm, at least about 9000 ppm, or atleast about 10000 ppm of the composition. In other embodiments, thenitric oxide is present at a concentration of no more than about 11000ppm, no more than about 10000 ppm, no more than about 9000 ppm, no morethan about 8000 ppm, no more than about 7000 ppm, no more than about6000 ppm, no more than about 5000 ppm, no more than about 4500 ppm, nomore than about 4000 ppm, no more than about 3500 ppm, no more thanabout 3000 ppm, no more than about 2500 ppm, no more than about 2000ppm, no more than about 1900 ppm, no more than about 1800 ppm, no morethan about 1700 ppm, no more than about 1600 ppm, no more than about1500 ppm, no more than about 1400 ppm, no more than about 1300 ppm, nomore than about 1200 ppm, no more than about 1100 ppm, no more thanabout 1000 ppm, no more than about 900 ppm, no more than about 800 ppm,no more than about 700 ppm, no more than about 600 ppm, no more thanabout 500 ppm, no more than about 400 ppm, or no more than about 300 ppmof the composition. Combinations of any of these are also possible. Forexample, in some embodiments, nitric oxide is present at a concentrationof between about 400 and about 900 ppm. NO content can be measured byany suitable technique. For example, in some embodiments, NO content ismeasured using a nitric oxide biosensor (e.g., nitric oxide macrosensorwith nitric oxide specific electrode from WPI Instruments). In someembodiments, NO content is measured by a change in weight in thecomposition after adding NO.

In some embodiments, nitric oxide, and in some aspects peptide, ispresent within a first phase comprising a lecithin, such asphosphatidylcholine. Phosphatidylcholine (herein abbreviated “PC”) is abasic component of cell membrane bilayers and the main phospholipidcirculating in the plasma of blood. Phosphatidylcholine typically has aphospholipid structure with a choline head group and a glycerophosphoricacid tail group. The tail group can be saturated or unsaturated. Morethan one tail group may be present in the phosphatidylcholine in somecases, and the tail groups may be the same or different. Specificnon-limiting examples of phosphatidylcholines that could be used includeone or a mixture of stearic, palmitic, margaric, and/or oleic aciddiglycerides linked to a choline ester head group.

Phosphatidylcholines are a member of a class of compounds calledlecithins. Typically, a lecithin is a composed of phosphoric acid,choline, fatty acids, glycerol, glycolipids, triglycerides, and/orphospholipids. In some cases, other lecithins may be used, in additionto or instead of a phosphatidylcholine. Non-limiting examples of otherlecithins include phosphatidylethanolamine, phosphatidylinositol, orphosphatidic acid. Many commercial lecithin products are available, suchas, for example, Lecithol®, Vitellin®, Kelecin®, and Granulestin®.Lecithin is widely used in the food industry. In some embodiments,certain compositions of the invention can contain synthetic or naturallecithin, or mixtures thereof. Natural preparations are used in somecases because they exhibit desirable physical characteristics, and/ormay be economical or nontoxic. However, in other embodiments,non-natural preparations are used, or the composition can include bothnatural and non-natural preparations.

Any suitable amount of phosphatidylcholine or lecithin may be presentwithin the composition. For example, at least about 0.25 wt %, at leastabout 0.5 wt %, at least about 1 wt %, at least about 2 wt %, at leastabout 3 wt %, at least about 5 wt %, at least about 8 wt %, at leastabout 10 wt %, at least about 20 wt %, at least about 30 wt %, at leastabout 40 wt %, at least about 50 wt %, at least about 60 wt %, at leastabout 70 wt %, at least about 80 wt %, or at least about 90 wt % of theentire composition can be a phosphatidylcholine or a lecithin. In somecases, the phosphatidylcholine or lecithin may be present at aconcentration of no more than about 95 wt %, no more than about 90 wt %,no more than about 80 wt %, no more than about 70 wt %, no more thanabout 65 wt %, no more than about 60 wt %, no more than about 50 wt %,no more than about 40 wt %, no more than about 30 wt %, no more thanabout 20 wt %, or no more than about 10%. Combinations of any of theseare also possible. For instance, the phosphatidylcholine or lecithin maybe present at between about 8 wt % and about 65 wt %, or between about 0wt % and about 10 wt %, etc. One or more than one type ofphosphatidylcholine or lecithin may be present.

Some delivery compositions of the present invention may containpolyenylphosphatidylcholine (herein abbreviated “PPC”). In some cases,PPC can be used to enhance epidermal penetration. The term“polyenylphosphatidylcholine,” as used herein, means anyphosphatidylcholine bearing two fatty acid moieties, wherein at leastone of the two fatty acids is an unsaturated fatty acid with at leasttwo double bonds in its structure, such as linoleic acid.

Certain types of soybean lecithin and soybean fractions, for example,can contain higher levels of polyenylphosphatidylcholine, withdilinoleoylphosphatidylcholine (18:2-18:2 phosphatidylcholine) as themost abundant phosphatidylcholine species therein, than conventionalfood grade lecithin. Such lecithins may be useful in formulating certaindelivery compositions. In some embodiments, conventional soybeanlecithin may be enriched with polyenylphosphatidylcholine, for instance,by adding soybean extracts containing high levels ofpolyenylphosphatidylcholine. As used herein, this type ofphosphatidylcholine is called “polyenylphosphatidylcholine-enriched”phosphatidylcholine (hereinafter referred to as PPC-enrichedphosphatidylcholine), even where the term encompasses lecithin obtainedfrom natural sources exhibiting polyenylphosphatidylcholine levelshigher than ordinary soybean varieties. These products are commerciallyavailable, for example, from American Lecithin Company, Rhone-Poulencand other lecithin vendors. American Lecithin Company markets itsproducts with a “U” designation, indicating high levels of unsaturation;Rhone-Poulenc's product is a soybean extract containing about 42%dilinoleoylphosphatidylcholine and about 24%palmitoyllinoleylphosphatidylcholine (16:0 to 18:2 of PC) as the majorphosphatidylcholine components. Another example of a suitablepolyenylphosphatidylcholine is NAT 8729 (also commercially availablefrom vendors such as Rhone-Poulenc and American Lecithin Company).

Any suitable amount of polyenylphosphatidylcholine may be present withinthe composition. For example, at least about 0.25 wt %, at least about0.5 wt %, at least about 1 wt %, at least about 2 wt %, at least about 3wt %, at least about 5 wt %, at least about 8 wt %, at least about 10 wt%, at least about 20 wt %, at least about 30 wt %, at least about 40 wt%, at least about 50 wt %, at least about 60 wt %, at least about 70 wt%, at least about 80 wt %, or at least about 90 wt % of the compositioncan be polyenylphosphatidylcholine. In some cases, thepolyenylphosphatidylcholine may be present at a concentration of no morethan about 95 wt %, no more than about 90 wt %, no more than about 80 wt%, no more than about 70 wt %, no more than about 65 wt %, no more thanabout 60 wt %, no more than about 50 wt %, no more than about 40 wt %,no more than about 30 wt %, no more than about 20 wt %, or no more thanabout 10%. Combinations of any of these are also possible. For instance,the polyenylphosphatidylcholine may be present at between about 8 wt %and about 65 wt %. In some embodiments, at least about 20 wt %, at leastabout 30 wt %, at least about 40 wt %, at least about 50 wt %, at leastabout 60 wt %, at least about 70 wt %, at least about 80 wt %, at leastabout 90 wt %, or about 100 wt % of all of the phosphatidylcholine orlecithin in the composition is polyenylphosphatidylcholine.

While not wishing to be bound to any theory, it is believed that thePPC-enriched phosphatidylcholine forms a bilayer enveloping nitric oxide(and in some embodiments, peptides and/or other adjunct ingredients, ifpresent) to create the composition. The PPC-enriched phosphatidylcholineis believed to contribute to the stability of the nitric oxide (and insome aspects peptide), for example, by shielding the nitric oxide (andin some aspects peptide) from water, and/or by enhancing its penetrationinto the skin or other area.

The first phase also comprises, in some embodiments of the invention, afatty acid ester. Non-limiting examples include ascorbate palmitate orisopropyl palmitate. In some cases, the fatty acid ester is used as apreservative or an antioxidant. The composition can include any suitableamount of fatty acid ester, for example, at least about 1 wt %, at leastabout 3 wt %, at least about 5 wt %, at least about 10 wt %, at leastabout 20 wt %, at least about 30 wt %, at least about 40 wt %, at leastabout 50 wt %, etc. In some cases, no more than about 60 wt %, no morethan about 50 wt %, no more than about 40 wt %, no more than about 30 wt%, no more than about 20 wt %, no more than about 18 wt %, no more thanabout 15 wt %, no more than about 12 wt %, or no more than about 10 wt %of the composition is fatty acid ester. Combinations of any of these arealso possible. For example, the composition may be between about 0 wt %and about 10 wt % fatty acid ester. The composition may include one ormore than one fatty acid ester.

In certain embodiments, a composition such as those described herein canbe formulated to include a second phase. Typically, the second phase issubstantially immiscible with the first phase comprisingphosphatidylcholine or lecithin. Two phases that are substantiallyimmiscible are able to form discrete phases when exposed to each otherat ambient conditions (e.g., 25° C. and 1 atm) for extended periods oftime (e.g., at least about a day). The phases can be separateidentifiable phases (e.g., one may float above the other), or in somecases, the phases are intermingled, e.g., as in an emulsion. Thestability of the discrete phases may be kinetic and/or thermodynamic innature, in various embodiments.

In one set of embodiments, the second phase may comprise an emulsifierwhich causes the first phase comprising phosphatidylcholine or lecithinto form a liquid crystal, and/or vesicles such as micelles or liposomes.Typically, in a liquid crystal phase, vesicular structures such asmicelles, liposomes, hexagonal phases, or lipid bilayers can be formed.In some cases, multilamellar structures may be present within the liquidcrystal phase, although in other cases, only unilamellar structures maybe present. For example, in certain cases, the PPC-enrichedphosphatidylcholine can be loosely arranged in a multilamellar fashion,with nitric oxide and optional peptides and adjunct ingredients beingbonded or otherwise entrapped or contained within the lipid bilayersformed therein. In some cases, the first phase (e.g., comprisingPPC-enriched phosphatidylcholine) and the second phase can form astructure such as is disclosed in U.S. Pat. No. 7,182,956 to Perricone,et al. This is believed (without wishing to be bound by any theory) toform a loosely arranged, yet stable, PPC-enrichedphosphatidylcholine-drug complex that may allow penetration and deliveryof nitric oxide, peptides, and optional adjunct ingredients to the skin,e.g., to the dermal vasculature.

In one set of embodiments, the second phase comprises an emulsifier. Theemulsifier, in one embodiment, is a substance that is able to stabilizean emulsion by increasing its kinetic stability. The emulsifier may alsobe chosen in some cases to be relatively inert or non-toxic relative tothe skin.

In some embodiments, the second phase may comprise a polyglycol. Thepolyglycol may include a polyhydric alcohol of a monomeric glycol suchas polyethylene glycol (PEG) and/or polypropylene glycol (PPG). Forexample, the PEG or PPG may be PEG or PPG 200, 300, 400, 600, 1,000,1,450, 3,350, 4,000, 6,000, 8,000, and 20,000, where the numberindicates the approximate average molecular weight of the PEG or PPG. Asis understood by those of ordinary skill in the art, a polyglycolcomposition often will comprise a range of molecular weights, althoughthe approximate average molecular weight is used to identify the typepolyglycol. More than one PEG and/or PPG can also be present in certaininstances.

The second phase may comprise a surfactant in some embodiments.Non-limiting examples of surfactants include a siloxylated polyethercomprising dimethyl, methyl(propylpolyethylene oxide propylene oxide,acetate) siloxane commercially available from vendors such as DowCorning (Dow Corning 190 surfactant). Other examples of materials thatcan be used as (or within) the second phase include, but are not limitedto, 1,2-propanediol, or silicone fluids containing low viscositypolydimethylsiloxane polymers, methylparaben (p-hydroxy benzoic acidmethyl ester) commercially available from vendors such as Dow Corning(Dow Corning 200 silicone fluid). Still other examples include varioussiloxane or silicone compounds, e.g., hexamethyldisiloxane,amodimethicone, phenyltrimethicone, etc.

Additionally, purified water may be added to the second phase in someembodiments, although in other cases, little or no water is present inthe second phase. For example, the first phase, the second phase, cancontain less than 10%, less than 5%, less than 2%, less than 1%, or lessthat 0.05% (e.g., wt %) of water relative to the weight of therespective phase or of the entire composition. In some cases, the secondphase may also comprise adjunct ingredients such as those describedherein.

The second phase may include any one, or more than one, of the materialsdescribed above. In addition, any suitable amount of second phase can beused in accordance with various embodiments of the invention. Forexample, the second phase may be present at least about 10 wt %, atleast about 20 wt %, at least about 30 wt %, at least about 40 wt %, atleast about 50 wt %, at least about 60 wt %, at least about 70 wt %, atleast about 80 wt %, or at least about 90 wt % of the composition. Insome cases, the ratio of the first phase (e.g., comprisingphosphatidylcholine or lecithin) to the second phase can be at leastabout 1:3, at least about 1:2, at least about 1:1, at least about 2:1,at least about 3:1, or at least about 4:1, etc.

In certain embodiments, a composition such as those described herein,e.g., those containing a peptide, and in some aspects also containingnitric oxide, may comprise a polyglycol. The polyglycol may include apolyhydric alcohol of a monomeric glycol such as polyethylene glycol(PEG) and/or polypropylene glycol (PPG). For example, the PEG or PPG maybe PEG or PPG 200, 300, 400, 600, 1,000, 1,450, 3,350, 4,000, 6,000,8,000, and 20,000, where the number indicates the approximate averagemolecular weight of the PEG or PPG. As is understood by those ofordinary skill in the art, a polyglycol composition often will comprisea range of molecular weights, although the approximate average molecularweight is used to identify the type polyglycol.

More than one PEG and/or PPG can also be present in certain instances.The composition can include any suitable amount of polyglycol, forexample, at least about 1 wt %, at least about 3 wt %, at least about 5wt %, at least about 10 wt %, at least about 20 wt %, at least about 30wt %, at least about 40 wt %, at least about 50 wt %, etc. In somecases, no more than about 60 wt %, no more than about 50 wt %, no morethan about 40 wt %, no more than about 30 wt %, no more than about 20 wt%, no more than about 18 wt %, no more than about 15 wt %, no more thanabout 12 wt %, or no more than about 10 wt % of the composition ispolyglycol. Combinations of any of these are also possible. For example,the composition may be between about 0 wt % and about 10 wt %polyglycol. The composition may include one or more than one type ofpolyglycol.

In some aspects, the formulation comprises a phosphatidylcholine, e.g.,any of those described herein (Phospholipon-90G (American LecithinCompany)). The composition can include any suitable amount ofphosphatidylcholine, for example, at least about 1 wt %, at least about3 wt %, at least about 5 wt %, at least about 10 wt %, at least about 20wt %, at least about 30 wt %, at least about 40 wt %, at least about 50wt %, at least about 60 wt %, at least about 70 wt %, at least about 80wt %, at least about 90 wt % etc. In some cases, no more than about 90wt %, no more than about 80 wt %, no more than about 70 wt %, no morethan about 60 wt %, no more than about 50 wt %, no more than about 40 wt%, no more than about 30 wt %, no more than about 20 wt %, no more thanabout 10 wt %, or no more than about 5 wt % of the composition isphosphatidylcholine. Combinations of any of these are also possible. Forexample, the composition may be between about 0 wt % and about 10 wt %surfactant. The composition may include one or more than onephosphatidylcholine. Other examples of materials that can be used as (orwithin) the formulation include, but are not limited to, benzyl alcohol,ethyl alcohol, isopropyl palmitate (IPP), propanediol, andcaprylic/capric triglycerides.

Any suitable amount of peptide may be present within a compositionprepared as described herein. One or more than one peptide may bepresent in some cases. For example, a peptide may be present at aconcentration, with respect to the volume of carrier (in cubiccentimeters) containing the peptide, of at least about 0.01 mg/cc, atleast about 0.02 mg/cc, at least about 0.03 mg/cc, at least about 0.04mg/cc, at least about 0.05 mc/cc, at least about 0.06 mg/cc, at leastabout 0.07 mg/cc, at least about 0.08 mg/cc, at least about 0.09 mg/cc,at least about 0.10 mg/cc, at least about 0.20 mg/cc, at least about0.30 mg/cc, at least about 0.40 mg/cc, at least about 0.50 mg/cc, atleast about 0.60 mg/cc, at least about 0.70 mg/cc, at least about 0.80mg/cc, at least about 0.90 mg/cc, at least about 1.0 mg/cc, at leastabout 1.5 mg/cc, at least about 2.0 mg/cc, at least about 2.5 mg/cc, atleast about 3.0 mg/cc, at least about 3.5 mg/cc, at least about 4.0mg/cc, at least about 4.5 mg/cc, at least about 5.0 mg/cc, at leastabout 5.5 mg/cc, at least about 6.0 mg/cc, at least about 6.5 mg/cc, atleast about 7.0 mg/cc, at least about 7.5 mg/cc, at least about 8.0mg/cc, at least about 8.5 mg/cc, at least about 9.0 mg/cc, at leastabout 9.5 mg/cc, at least about 10.0 mg/cc, at least about 15.0 mg/cc,at least about 20.0 mg/cc, at least about 25.0 mg/cc, at least about30.0 mg/cc, at least about 35.0 mg/cc, at least about 40.0 mg/cc, atleast about 45.0 mg/cc, at least about 50.0 mg/cc, at least about 60.0mg/cc, at least about 70.0 mg/cc, at least about 80.0 mg/cc, at leastabout 90.0 mg/cc, at least about 100 mg/cc, at least about 125 mg/cc, atleast about 150 mg/cc, at least about 175 mg/cc, at least about 200mg/cc, at least about 250 mg/cc, at least about 300 mg/cc, at leastabout 400 mg/cc, at least about 500 mg/cc, at least about 750 mg/cc, orat least about 1000 mg/cc.

In certain cases, the peptide may be present at a concentration of nomore than about 1500 mg/cc, no more than about 1000 mg/cc, no more thanabout 800 mg/cc, no more than about 600 mg/cc, no more than about 400mg/cc, no more than about 200 mg/cc, no more than about 100 mg/cc, nomore than about 75 mg/cc, no more than about 50 mg/cc, no more thanabout 25 mg/cc, no more than about 20 mg/cc, no more than about 15mg/cc, no more than about 12.5 mg/cc, no more than about 10.0 mg/cc, nomore than about 9.0 mg/cc, no more than about 8.0 mg/cc, no more thanabout 7.0 mg/cc, no more than about 6.0 mg/cc, no more than about 5.5mg/cc, no more than about 5.0, no more than about 4.5 mg/cc, no morethan about 4.0 mg/cc, no more than about 3.5 mg/cc, no more than about3.0 mg/cc, no more than about 2.5 mg/cc, no more than about 2.0 mg/cc,no more than about 1.5 mg/cc, no more than about 1.0 mg/cc, no more thanabout 0.5 mg/cc, no more than about 0.1 mg/cc, or no more than about0.01 mg/cc. Combinations of any of these are also possible. For example,the peptide may be present at a concentration of between about 0.5 mg/ccand about 50.0 mg/cc. In some embodiments, the composition alsocomprises a suitable amount of nitric oxide, e.g., as provided herein.

In some embodiments, a peptide may be added to a composition during orafter the formulation of any phase or composition as described herein,e.g., by routine methods known in the art. For example, the peptide maybe added to any phase of a formulation or composition, or after anyformulation or composition described herein is made. In some cases, forexample, the peptide may be added before or after nitric oxide is addedto the mixture, or before or after the first and second phases are mixedtogether. The peptide may be added to either the first phase or thesecond phase, depending on the type of peptide. In some cases, thepeptide may be added after the first phase or the second phase afteremulsification. The peptide may be present in a hydrophilic portion(e.g., a first portion) or a hydrophobic portion (e.g., a secondportion) of a formulation, depending on the peptide. For example, if theformulation is an emulsion, a hydrophilic peptide may be containedwithin a hydrophilic phase of the emulsion, while a hydrophobic peptidemay be contained within a hydrophobic phase of the emulsion; a peptidehaving both hydrophilic portions and hydrophobic portions may becontained at an interface between hydrophilic and hydrophobic phases ofthe emulsion. Accordingly, a variety of peptides, having differentproperties, may be used in various formulations and embodiments of thepresent invention, including any of the peptides described herein.Similarly, nitric oxide may be added during or after the formulation ofany phase or composition as described herein, e.g., by routine methodsand those described herein, e.g., by bubbling nitric oxide gas throughany phase, formulation, or composition, as described herein.

In another set of embodiments, the composition may also include one ormore transdermal penetration enhancers. Examples of transdermalpenetration enhancers include, but are not limited to,1,3-dimethyl-2-imidazolidinone or 1,2-propanediol. Other examplesinclude cationic, anionic, or nonionic surfactants (e.g., sodium dodecylsulfate, polyoxamers, etc.); fatty acids and alcohols (e.g., ethanol,oleic acid, lauric acid, liposomes, etc.); anticholinergic agents (e.g.,benzilonium bromide, oxyphenonium bromide); alkanones (e.g., n-heptane);amides (e.g., urea, N,N-dimethyl-m-toluamide); organic acids (e.g.,citric acid); sulfoxides (e.g., dimethylsulfoxide); terpenes (e.g.,cyclohexene); ureas; sugars; carbohydrates or other agents. Thetransdermal penetration enhancers can be present in any suitable amountwithin the composition. For example, at least about 10 wt %, at leastabout 20 wt %, at least about 30 wt %, at least about 40 wt %, or atleast about 50 wt % of the composition may comprise one or moretransdermal penetration enhancers. In some cases, no more than about 60wt %, no more than about 50 wt %, no more than about 40 wt %, no morethan about 30 wt %, no more than about 20 wt %, no more than about 10 wt%, no more than about 9 wt %, or no more than about 5 wt % of thecomposition comprises transdermal penetration enhancers. Combinations ofany of these are also possible. For example, the composition may havebetween about 0 wt % and about 5 wt % of one or more transdermalpenetration enhancers.

In other embodiments, the composition may be modified in order tocontrol depth of penetration. For example, in certain embodiments, thecomposition includes one or more polymers that act to reduce penetrationdepth of nitric oxide and/or peptide. Controlled depth of penetrationmay be important for indications where local administration is desiredwithout systemic effects. Examples of transdermal penetration barrierpolymers include, but are not limited to, silicone waxes, acrylatepolymers, and dimethicone copolymers. In certain embodiments, atransdermal penetration barrier polymer is nonionic. A transdermalpenetration barrier polymer can be present in any suitable amount withinthe composition. For example, at least about 10 wt %, at least about 20wt %, at least about 30 wt %, at least about 40 wt %, or at least about50 wt % of the composition may comprise one or more transdermalpenetration barrier polymers. In some cases, no more than about 60 wt %,no more than about 50 wt %, no more than about 40 wt %, no more thanabout 30 wt %, no more than about 20 wt %, no more than about 10 wt %,no more than about 9 wt %, or no more than about 5 wt % of thecomposition comprises a transdermal penetration barrier polymer.Combinations of any of these are also possible. For example, thecomposition may have between about 0 wt % and about 5 wt % of one ormore transdermal penetration barrier polymers.

As a specific non-limiting example of one set of embodiments, apolyenylphosphatidylcholine comprises a certain material with the tradename NAT 8729, and optionally at least one polyglycol (polyhydricalcohol of a monomeric glycol such as polyethylene glycol 200, 300, 400,600, 1,000, 1,450, 3,350, 4,000, 6,000, 8,000 and 20,000). Thecomposition can also comprise a PPC-enriched phosphatidylcholinematerial that is present within the first or second phase, e.g.,comprising nitric oxide. The second phase may also comprise a surfactantsuch as a siloxylated polyether comprising dimethyl,methyl(propylpolyethylene oxide propylene oxide, acetate) siloxanecommercially available from vendors such as Dow Corning (Dow Corning 190surfactant) and lubricant such as silicone fluids containing lowviscosity polydimethylsiloxane polymers, methylparaben (p-hydroxybenzoic acid methyl ester) commercially available from vendors such asDown Corning (Dow Corning 200 silicone fluid).

In some embodiments, various compositions of the invention areformulated to be substantially clear or substantially transparent.Transparency may be useful, for instance, for product acceptance in themarketplace, e.g., when applied to the skin of a subject. However, inother embodiments, the composition is not necessarily transparent.Certain substances can be useful in providing a substantiallytransparent composition, for example, fatty acid esters such asascorbate palmitate or isopropyl palmitate. In one set of embodiments,the composition may be substantially transparent such that incidentvisible light (e.g., have wavelengths of between about 400 nm and about700 nm) can be transmitted through 1 cm of the composition with a lossin intensity of no more than about 50%, about 60%, about 70%, about 80%,or about 90% relative to the incident light. In some embodiments, theremay be no substantial difference in the wavelengths that are absorbed bythe composition (i.e., white light passing through the compositionappears white), although in other cases, there can be more absorption atvarious wavelengths (for example, such that white light passing throughthe composition may appear colored).

Other components may also be present within the composition, inaccordance with certain embodiments of the invention. For example, thecomposition may include volatile organic fluids, fatty acids, volatilearomatic cyclic compounds, high molecular weight hydrocarbons, or thelike.

In accordance with certain aspects of the invention, the composition maybe prepared by mixing a first phase and a second phase together, thenpassing nitric oxide through the mixture. As discussed above, the secondphase can comprise an emulsifier, or any other components discussedherein. The first phase may comprise a lecithin such asphosphatidylcholine and/or polyenylphosphatidylcholine, e.g.,PPC-enriched phosphatidylcholine, for instance, as described herein. Insome embodiments, other components are also mixed into the composition,before or after (or while) adding nitric oxide, for example, transdermalpenetration enhancers, adjuvants, polyglycols (e.g., PEG and/or PPG),surfactants, lubricants, etc. as discussed herein. In some embodiments,however, nitric oxide may be passed through the first phase prior tomixing of the first phase with the second phase.

In one set of embodiments, after forming the mixture, nitric oxide canbe passed into or through the mixture, for example, by blowing bubblesof nitric oxide through the mixture. Nitric oxide may be delivered intothe mixture under pressures such as between about 3,000 Pa and about15,000 Pa, between about 5,000 Pa and about 10,000 Pa, or between about6,000 Pa and about 8,000 Pa, and/or temperatures such as between about0° C. and about 50° C., between about 20° C. and about 35° C., or about25° C. and about 30° C. However, higher or lower pressures also may beused in some embodiments as aspects of the invention are not limited inthis respect.

In certain embodiments, the nitric oxide is bubbled through the mixtureuntil the mixture begins to at least partially solidify. As an example,the viscosity of the mixture may increase to at least about 1,000 cP, atleast about 2,000 cP, at least about 3,000 cP, at least about 5,000 cP,at least about 7,000 cP, at least about 10,000 cP, at least about 12,000cP, at least about 15,000 cP, at least about 20,000 cP, at least about30,000 cP, at least about 40,000 cP, at least about 50,000 cP, at leastabout 60,000 cP, at least about 70,000 cP, or at least about 80,000 cP.The nitric oxide can be passed through the mixture as pure nitric oxide,and/or with other gases (e.g., a noble gas, for example, argon). In somecases, a nitric oxide donor may be passed into the mixture, and therein,at least some of the nitric oxide donor can be converted into nitricoxide. In other embodiments, however, the final composition may havelower viscosities, for example, such that the composition is liquid, orcould be sprayed onto the skin.

In one set of embodiments, the nitric oxide can be bubbled through themixture to cause the viscosity of the mixture to increase. For example,the viscosity can increase until the mixture begins to form a gel, acream, a lotion, an ointment, a solid “stick,” or the like. A cream maybe, for example, a semi-solid emulsion, e.g., comprising a first phaseand a second phase. The first phase may be discontinuous (e.g.,comprising small droplets or vesicles, such as is discussed herein) andthe second phase may be continuous, or vice versa. In some cases,however, both the first phase and the second phase are co-continuouswithin the mixture.

In some embodiments of the invention, a composition may be prepared asdiscussed above, then diluted, e.g., with a diluent, to produce a finalcomposition. For example, a “stock” composition may be initiallyprepared, e.g., having a relatively high nitric oxide concentration (andin some aspects a relatively high peptide concentration), then the stockcomposition diluted to produce a final composition, e.g., before use,before storage, before packaging, etc. In some embodiments, the diluentused may be a component as discussed herein (for example, forming atleast a portion of the second phase), and the same or differentmaterials than may be present in the initial composition may be used.The dilution ratio (amount of diluent added, relative to the initialcomposition) may be at least about 2, at least about 3, at least about5, at least about 10, at least about 15, at least about 20, at leastabout 25, at least about 30, at least about 50, or at least about 100,or any other suitable factor.

A composition may be prepared and/or stored at any suitable temperatureand under any suitable conditions. In some embodiments, for instance, acomposition can be prepared and/or stored under limited or no oxygenconditions, as oxygen can adversely react with nitric oxide. Thecomposition can also be prepared and/or stored under limited or nonitrogen and/or carbon dioxide, as both can also react adversely withnitric oxide. For instance, the composition may be prepared and/orstored in a sealed environment (e.g., stored in a sealed container). Thesealed environment (e.g., container) can be at least substantiallydevoid of gas, and/or contains a gaseous mixture that excludes, or atleast is depleted in, oxygen. In some embodiments, an environmentdepleted in oxygen may have less than about 20%, less than about 15%,less than about 10%, less than about 5%, about 1% or less, about 0.1% orless, about 0.01% or less, about 0.001% or less, oxygen (e.g., as a wt %or as molar % per volume). For example, the gaseous mixture may includea noble gas, such as argon, helium, neon, etc. In one set ofembodiments, the container may comprise a multi-layered metallic and/orpolymeric barrier, e.g., formed from Glaminate® (American Can Company).For instance, the container may have the shape of a tube. Thus, incertain embodiments, the container is substantially resistant to oxygenpermeation, nitrogen permeation, and/or carbon dioxide permeation. Incertain embodiments, the container is substantially watertight, forexample, such that substantially no water is absorbed by the container,or such that no water is able to pass through the container even if thecontainer is filled with water.

As previously discussed, nitric oxide can react with water, and thus,compositions described herein may be prepared and/or stored underconditions where substantially no water is present. For example, nitricoxide and/or a nitric oxide containing preparation described herein maybe prepared and/or stored under relatively low relative humidities(e.g., less than about 50% RH, less than about 40% RH, less than about30% RH, less than about 20% RH, or less than about 10% RH), and/or inthe presence of a suitable desiccant, such as phosphorous pentoxide orsilica gel.

In certain embodiments, the mixture may be mixed with or otherwiseinclude adjunct ingredients, if applicable, and nitric oxide may beintroduced to the mixture, e.g., bubbles of nitric oxide gas may beblown into the mixture until the mixture hardens to obtain the desiredfinal composition. As a specific non-limiting example, a nitric oxidecomposition may be formed by preparing a non-liposome multilamellarliquid crystal phosphatidylcholine phase, for example, by providing apolyglycol, then introducing phosphatidyl choline into the glycol atroom temperature to form a phosphatidylcholine solution. Thephosphatidylcholine often comes as a solid (e.g., as a “brick” ofmaterial), and the phosphatidylcholine may be broken down into smallerpieces to aid in mixing, e.g., by “shaving” or grinding thephosphatidylcholine solid. The phosphatidylcholine solution is mixeduntil the phosphatidylcholine solution is substantially clear, then onemay warm the phosphatidylcholine solution to 40° C., mill the warmedsolution (i.e., low agitation after the initial mixing), combinesiloxylated polyether and polydimethylsiloxane to form a fluid, add thefluid to the warmed solution and milling until the solution is clear,adding methyl paraben or other suitable lubricant to the solution andmilling until the methyl paraben dissolves in the solution, warm waterto 40° C. and adding the warmed water slowly to the solution, and thenceasing milling of the solution and “sweeping” the solution (e.g., witha sweep mixer) to cool to room temperature. Nitric oxide gas can then bebubbled or otherwise introduced into the solution while cooling thesolution until the solution begins to harden or becomes stiff, e.g.,having the consistency of a gel or a cream, such as previouslydescribed. In some cases, the resulting composition is sealed in acontainer, for example, as discussed herein. Any suitable container maybe used, e.g., a tube or a bottle. In addition, the composition (e.g.,within the container) may be stored at room temperature, or any othersuitable temperature. For example, a composition of the invention may bestored at or below 80° C., e.g., at or below room temperature (about 25°C.) or in a refrigerator (e.g., at 4° C.) for extended period ofstorage, for instance, to prevent nitric oxide (and in some aspectspeptide) leakage or denaturing. In some cases, storage may extend for atleast about a week, at least about 4 weeks, at least about 6 months, atleast about a year, etc.

It is surprising that, according to some embodiments, nitric oxide (andin some aspects peptide) not only can be entrapped inphosphatidylcholine or lecithin compositions such as those describedherein, but also that such entrapped compositions may have a long shelflife, especially when refrigerated. No loss or reaction of nitric oxide(and in some aspects peptide) is expected during extended refrigeratedstorage, at least under certain conditions. For instance, in certainembodiments, the composition may be stored at temperatures of less thanabout 80° C., less than about 70° C., less than about 60° C., less thanabout 50° C., less than about 40° C., less than about 30° C., less thanabout 25° C., less than about 20° C., less than about 15° C., less thanabout 10° C., less than about 5° C., less than about 0° C., etc., forextended periods of time, e.g., at least about a day, at least about aweek, at least about 4 weeks, at least about 6 months, etc.

Without wishing to be bound by theory, it is believed that nitric oxideforms reversible physical bonds, similar to hydrogen bonds or van derWaals forces, with phosphatidylcholine or other lecithin molecules,e.g., containing one or more double bonds, which may allow nitric oxideto become entrapped and thereby remain intact for an extended period oftime, e.g., during storage. These physical bonds, however, are believedto be not very stable, and may in some cases be easily broken up, forexample, upon various physical agitations such as rubbing thecomposition against skin, thereby releasing the entrapped nitric oxide.While others have stabilized other substances or drugs withinphosphatidylcholine or lecithin compositions or vesicles, for example,protein drugs such as insulin, it is surprising that a small, highlyreactive molecule such as NO could similarly be stabilized, especiallywhen it would have been expected that a molecule as small as NO wouldreadily diffuse away from such compositions and/or would have reactedwith water that is typically present within such compositions.

In some embodiments, it is believed that other species reactive withwater could also be similarly stabilized, e.g., within a composition asherein described. Any species that ordinarily reacts with water could bestabilized within such compositions. Examples of such species include,but are not limited to, lithium, or drugs or polymers with labile bondssusceptible to hydrolysis, for instance, certain peptides,polysaccharides, polylactic acid, polyglycolic acid, etc.

In certain aspects of the invention, a composition such as thosedescribed herein can be administered to a subject, such as a humansubject, by rubbing it on the skin of the subject, e.g., in areaslocated at or at least within the vicinity of a desired target area.Without wishing to be bound by any theory, it is believed thatphosphatidylcholine provides or facilitates delivery of nitric oxide,and in some aspects peptides, to the skin, and/or to tissues below theskin, allowing nitric oxide, and in some aspects peptides, to bedelivered to a target area. In some embodiments, the composition can beapplied, by rubbing the composition topically against the skin, whichallows the composition (or at least, nitric oxide, and in some aspectspeptide) to be absorbed by the skin. The composition can be appliedonce, or more than once. For example, the composition may beadministered at predetermined intervals. In some embodiments, forinstance, the composition may be applied once per day, twice per day, 3times per day, 4 times per day, once every other day, once every threedays, once every four days, etc. The amount of nitric oxide (and in someaspects peptide) necessary to bring about the therapeutic treatment isnot fixed per se, and may depend upon factors such as the desiredoutcome, the type and severity the disease or condition, the form ofnitric oxide (and in some aspects peptide), the concentration of nitricoxide (and in some aspects peptide) present within the composition, etc.

Thus, another aspect of the invention provides methods of administeringany composition such as discussed herein to a subject. Whenadministered, the compositions of the invention are applied in atherapeutically effective, pharmaceutically acceptable amount as apharmaceutically acceptable formulation. Any of the compositions of thepresent invention may be administered to the subject in atherapeutically effective dose. When administered to a subject,effective amounts will depend on the particular condition being treatedand the desired outcome. A therapeutically effective dose may bedetermined by those of ordinary skill in the art, for instance,employing factors such as those described herein and using no more thanroutine experimentation.

In certain embodiments of the invention, the administration of variouscompositions of the invention may be designed so as to result insequential exposures to the composition over a certain time period, forexample, hours, days, weeks, months, or years. This may be accomplished,for example, by repeated administrations of a composition of theinvention by one or more of the methods described herein, or by asustained or controlled release delivery system in which the compositionis delivered over a prolonged period without repeated administrations.Administration of the composition using such a delivery system may be,for example, by a transdermal patch. Maintaining a substantiallyconstant concentration of the composition may be preferred in somecases.

For certain chronic treatments or therapies, it is contemplated that acomposition as discussed herein may be used to deliver nitric oxideand/or peptide to the skin at a relatively high concentration during aninitial treatment, and the amount of nitric oxide and/or peptide may belowered or “titrated” down to a relatively lower concentrationmaintenance dose or amount. A nitric oxide containing composition asdescribed herein can be used to promote vasodilation of blood vesselswithin and/or under the skin. As a specific example, a compositiondescribed herein may be used for certain treatments of skin and/or forimproving skin appearance, e.g., wrinkles. In some cases, gradualimprovement may be observed with successive applications.

In some embodiments, an effective amount is an amount sufficient to havea measurable positive effect on blood flow and/or vasodilation, and/or ameasurable negative effect on blood pressure. In some embodiments, theeffect on blood flow and/or vasodilation is observed local to the siteof topical application. In some embodiments, an effective amount is anamount sufficient to have a measurable effect on treatments of skinand/or for improving skin appearance, such as is described herein.

In one set of embodiments, compositions described herein can beadministered to a subject in a dosage range from between about 0.01 toabout 10,000 mg/kg body weight/day, about 0.01 to about 5000 mg/kg bodyweight/day, about 0.01 to about 3000 mg/kg body weight/day, about 0.01to about 1000 mg/kg body weight/day, about 0.01 to about 500 mg/kg bodyweight/day, about 0.01 to about 300 mg/kg body weight/day, about 0.01 toabout 100 mg/kg body weight/day.

In one set of embodiments, the dosage may be between about 0.01 mg andabout 500 g, between about 0.01 mg and about 300 g, between about 0.01mg and about 100 g, between about 0.01 mg and about 30 g, between about0.01 mg and about 10 g, between about 0.01 mg and about 3 g, betweenabout 0.01 mg and about 1 g, between about 0.01 mg and about 300 mg,between about 0.01 mg and about 100 mg, between about 0.01 mg and about30 mg, between about 0.01 mg and about 10 mg, between about 0.01 mg andabout 3 mg, between about 0.01 mg and about 1 mg, between about 0.01 mgand about 0.3 mg, or between about 0.01 mg and about 0.1 mg.

In another set of embodiments, the dosage may be at least about 0.01 mg,at least about 0.02 mg, at least about 0.03 mg, at least about mg, atleast about 0.05 mg, at least about 0.1 mg, at least about 0.2 mg, atleast about 0.3 mg, at least about 0.5 mg, at least about 1 mg, at leastabout 2 mg, at least about 3 mg, at least about 5 mg, at least about 10mg, at least about 20 mg, at least about 30 mg, at least about 50 mg, atleast about 100 mg, at least about 200 mg, at least about 300 mg, atleast about 500 mg, at least about 1 g, at least about 2 g, at leastabout 3 g, at least about 5 g, at least about 10 g, etc. In some cases,the dosage may be no more than about 10 g, no more than about 5 g, nomore than about 3 g, no more than about 2 g, no more than about 1 g, nomore than about 500 mg, no more than about 300 mg, no more than about200 mg, no more than about 100 mg, no more than about 50 mg, no morethan about 30 mg, no more than about 20 mg, no more than about 10 mg, nomore than about 5 mg, no more than about 3 mg, no more than about 2 mg,no more than about 1 mg, no more than about 0.5 mg, no more than about0.3 mg, no more than about 0.2 mg, no more than about 0.1 mg, no morethan about 0.05 mg, no more than about 0.03 mg, no more than about 0.02mg, no more than about 0.01 mg, etc. In some cases, combinations of anyof these are also possible, e.g., between about 0.01 mg and about 0.1mg.

The compositions described herein can be used in combination therapywith one or more additional therapeutic agents. For combinationtreatment with more than one active agent, where the active agents arein separate dosage formulations, the active agents may be administeredseparately or in conjunction. In addition, the administration of oneelement may be prior to, concurrent to, or subsequent to theadministration of the other agent. In certain embodiments, theadditional therapeutic agent is present in a provided composition inaddition to nitric oxide and/or peptides. In other embodiments, theadditional therapeutic agent is administered separately from the nitricoxide and/or peptide containing composition.

When co-administered with other agents, an “effective amount” of thesecond agent will depend on the type of drug used. Suitable dosages areknown for approved agents and can be adjusted by the skilled artisanaccording to the condition of the subject, the type of condition(s)being treated and the amount of a compound described herein being used.In cases where no amount is expressly noted, an effective amount shouldbe assumed.

In certain embodiments, a nitric oxide and/or peptide containingcomposition as described herein, and the additional therapeutic agentare each administered in an effective amount (i.e., each in an amountwhich would be therapeutically effective if administered alone). Inother embodiments, a nitric oxide and/or peptide containing compositionas described herein, and the additional therapeutic agent are eachadministered in an amount which alone does not provide a therapeuticeffect (a sub-therapeutic dose). In yet other embodiments, a nitricoxide and/or peptide containing composition as described herein can beadministered in an effective amount, while the additional therapeuticagent is administered in a sub-therapeutic dose. In still otherembodiments, a nitric oxide and/or peptide containing composition asdescribed herein can be administered in a sub-therapeutic dose, whilethe additional therapeutic agent is administered in an effective amount.

As used herein, the terms “in combination” or “co-administration” can beused interchangeably to refer to the use of more than one therapy (e.g.,one or more prophylactic and/or therapeutic agents). The use of theterms does not restrict the order in which therapies (e.g., prophylacticand/or therapeutic agents) are administered to a subject.

Co-administration encompasses administration of the first and secondamounts of the compounds in an essentially simultaneous manner, such asin a single pharmaceutical composition, for example, capsule or tablethaving a fixed ratio of first and second amounts, or in multiple,separate capsules or tablets for each. In addition, suchco-administration also encompasses use of each compound in a sequentialmanner in either order. When co-administration involves the separateadministration of the first amount of a composition as described herein,and a second amount of an additional therapeutic agent, the compoundsare administered sufficiently close in time to have the desiredtherapeutic effect. For example, the period of time between eachadministration which can result in the desired therapeutic effect, canrange from minutes to hours and can be determined taking into accountthe properties of each compound. For example, a composition as describedherein, and the second therapeutic agent can be administered in anyorder within about 24 hours of each other, within about 16 hours of eachother, within about 8 hours of each other, within about 4 hours of eachother, within about 1 hour of each other or within about 30 minutes ofeach other.

More specifically, a first therapy (e.g., a prophylactic or therapeuticagent such as a composition described herein) can be administered priorto (e.g., 5 minutes, 15 minutes, 30 minutes, 45 minutes, 1 hour, 2hours, 4 hours, 6 hours, 12 hours, 24 hours, 48 hours, 72 hours, 96hours, 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 8 weeks, or12 weeks before), concomitantly with, or subsequent to (e.g., 5 minutes,15 minutes, 30 minutes, 45 minutes, 1 hour, 2 hours, 4 hours, 6 hours,12 hours, 24 hours, 48 hours, 72 hours, 96 hours, 1 week, 2 weeks, 3weeks, 4 weeks, 5 weeks, 6 weeks, 8 weeks, or 12 weeks after) theadministration of a second therapy to a subject.

In one set of embodiments, a composition such as is discussed herein maybe applied to the skin of a subject, e.g., at any suitable location. Thecomposition may be contacted using any suitable method. For example, thecomposition may be rubbed on, poured on, applied with an applicator(e.g., a gauze pad, a swab, a bandage, etc.), or the like. In somecases, the composition can be a liquid, a gel, a cream, a lotion, anointment, a solid “stick,” or the like, that can be applied to the skinby hand, for example, by rubbing or spraying.

Compared to other means of administration, the use of topicaladministration in certain embodiments of the present invention hasvarious advantages, including one or more of the following. In somecases, administration of a composition and delivery of nitric oxide (andin some aspects peptide) as discussed herein is easier and moreeffective than other drug administration routes, for example, oraldelivery. Unlike oral administration where a substantial amount ofnitric oxide, and in some aspects peptide, may be destroyed during thedigestive process, nitric oxide (and in some aspects peptide) deliveredtopically is not exposed to the digestive tract. Topical application mayalso allow, in some instances, relatively steady delivery of nitricoxide (and in some aspects peptide) to the desired target area withoutthe cyclic dosages typical of orally or parenterally administered drugs.In some embodiments, topical application may also avoid toxic sideeffects associated with sustained increased levels of nitric oxidetypical of oral or parenteral administration.

Compared to other topical delivery systems that employ nitric oxidedonors (an entity that is able to release nitric oxide, such asL-arginine, nitroglycerin, or amyl nitrite) as a nitric oxide source,various aspects of the present invention utilizing nitric oxide gas haveseveral advantages, including one or more of the following. Nitric oxidecan be released relatively quickly in some embodiments, because therelease does not necessarily involve chemical transformations of nitricoxide donors to release nitric oxide. The concentration of nitric oxidecan accumulate quickly upon topical administration, leading to goodtherapeutic effect in certain embodiments of the invention. Thus, forexample, rapid nitric oxide delivery may provide quicker effect inaddressing issues of skin appearance than is possible with oral dosagedrugs. In other applications, it is expected that nitric oxide can besimilarly delivered rapidly. In some embodiments, the release rate ofnitric oxide (and in some aspects peptide) can be controlled, forinstance, by physical actions (e.g., by controlling how much of thecomposition is applied to the skin), in comparison to nitric oxidedonors which release nitric oxide upon chemical stimulation. Moreover,certain embodiments of the present invention employ phosphatidylcholine,a component of cell membranes, as a carrier which improves thepenetration and absorption of nitric oxide (and in some aspects peptide)into cells and tissues. Thus, certain compositions of the presentinvention will be non-toxic or biocompatible.

The compositions of the present invention may additionally comprise oneor more adjunct ingredients, for instance, pharmaceutical drugs or skincare agents. For example, compositions of the invention may includeadjuvants such as salts, buffering agents, diluents, excipients,chelating agents, fillers, drying agents, antioxidants, antimicrobials,preservatives, binding agents, bulking agents, silicas, solubilizers, orstabilizers. Non-limiting examples include species such as calciumcarbonate, sodium carbonate, lactose, kaolin, calcium phosphate, orsodium phosphate; granulating and disintegrating agents such as cornstarch or algenic acid; binding agents such as starch, gelatin oracacia; lubricating agents such as magnesium stearate, stearic acid, ortalc; time-delay materials such as glycerol monostearate or glyceroldistearate; suspending agents such as sodium carboxymethylcellulose,methylcellulose, hydroxypropylmethylcellulose, sodium alginate,polyvinylpyrrolidone; dispersing or wetting agents such as lecithin orother naturally-occurring phosphatides; thickening agents such as cetylalcohol or beeswax; buffering agents such as acetic acid and saltsthereof, citric acid and salts thereof, boric acid and salts thereof, orphosphoric acid and salts thereof; or preservatives such as benzalkoniumchloride, chlorobutanol, parabens, or thimerosal. Suitableconcentrations can be determined by those of ordinary skill in the art,using no more than routine experimentation. Those of ordinary skill inthe art will know of other suitable formulation ingredients, or will beable to ascertain such, using only routine experimentation.

Preparations can include sterile aqueous or nonaqueous solutions,suspensions and emulsions, which can be isotonic with the blood of thesubject in certain embodiments. Examples of nonaqueous solvents arepolypropylene glycol, polyethylene glycol, vegetable oil such as oliveoil, sesame oil, coconut oil, arachis oil, peanut oil, mineral oil,organic esters such as ethyl oleate, or fixed oils including syntheticmono or di-glycerides. Aqueous solvents include water, alcoholic/aqueoussolutions, emulsions or suspensions, including saline and bufferedmedia. Parenteral vehicles include sodium chloride solution,1,3-butandiol, Ringer's dextrose, dextrose and sodium chloride, lactatedRinger's or fixed oils. Intravenous vehicles include fluid and nutrientreplenishers, electrolyte replenishers (such as those based on Ringer'sdextrose), and the like. Preservatives and other additives may also bepresent such as, for example, antimicrobials, antioxidants, chelatingagents and inert gases and the like. Those of skill in the art canreadily determine the various parameters for preparing and formulatingthe compositions of the invention without resort to undueexperimentation.

In another aspect, the present invention is directed to a kit includingone or more of the compositions discussed herein. A “kit,” as usedherein, typically defines a package or an assembly including one or moreof the compositions of the invention, and/or other compositionsassociated with the invention, for example, as described herein. Each ofthe compositions of the kit may be provided in liquid form (e.g., insolution), or in solid form (e.g., a dried powder). In certain cases,some of the compositions may be constitutable or otherwise processable(e.g., to an active form), for example, by the addition of a suitablesolvent or other species, which may or may not be provided with the kit.Examples of other compositions or components associated with theinvention include, but are not limited to, solvents, surfactants,diluents, salts, buffers, chelating agents, fillers, antioxidants,binding agents, bulking agents, preservatives, drying agents,antimicrobials, needles, syringes, packaging materials, tubes, bottles,flasks, beakers, dishes, frits, filters, rings, clamps, wraps, patches,containers, and the like, for example, for using, administering,modifying, assembling, storing, packaging, preparing, mixing, diluting,and/or preserving the compositions components for a particular use, forexample, to a sample and/or a subject.

A kit of the invention may, in some cases, include instructions in anyform that are provided in connection with the compositions of theinvention in such a manner that one of ordinary skill in the art wouldrecognize that the instructions are to be associated with thecompositions of the invention. For instance, the instructions mayinclude instructions for the use, modification, mixing, diluting,preserving, administering, assembly, storage, packaging, and/orpreparation of the composition and/or other compositions associated withthe kit. In some cases, the instructions may also include instructionsfor the delivery and/or administration of the compositions, for example,for a particular use, e.g., to a sample and/or a subject. Theinstructions may be provided in any form recognizable by one of ordinaryskill in the art as a suitable vehicle for containing such instructions,for example, written or published, verbal, audible (e.g., telephonic),digital, optical, visual (e.g., videotape, DVD, etc.) or electroniccommunications (including Internet or web-based communications),provided in any manner.

International Patent Application No. PCT/US2012/000151, filed Mar. 17,2012, entitled “Topical Nitric Oxide Systems and Methods of UseThereof,” by Nicolas V. Perricone, et al., is incorporated herein byreference in its entirety. In addition, the following applications, eachfiled on Sep. 19, 2012, each by Nicholas V. Perricone, are herebyincorporated by reference in their entireties: “Systems and Methods forTreatment of Acne Vulgaris and Other Conditions with a Topical NitricOxide Delivery System” (U.S. patent application Ser. No. 13/623,008);“Treatment of Skin and Soft Tissue Infection with Nitric Oxide” (U.S.patent application Ser. No. 13/623,010); “Methods and Systems forTreatment of Inflammatory Dermatoses with Nitric Oxide” (U.S. patentapplication Ser. No. 13/623,014); “Prevention and Treatment ofCardiovascular Diseases using Systems and Methods for Transdermal NitricOxide Delivery” (U.S. patent application Ser. No. 13/623,018);“Treatment and Prevention of Learning and Memory Disorders” (U.S. patentapplication Ser. No. 13/623,022); “Methods and Compositions for Muscularor Neuromuscular Diseases” (U.S. patent application Ser. No.13/622,998); “Compositions and Methods for Treatment of Osteoporosis andOther Indications” (U.S. patent application Ser. No. 13/623,004);“Techniques and Systems for Treatment of Neuropathic Pain and OtherIndications” (U.S. patent application Ser. No. 13/623,027); and “CancerTreatments and Compositions for Use Thereof” (U.S. patent applicationSer. No. 13/622,989).

Additionally, the following U.S. patent applications, each filed on Mar.13, 2013, are hereby incorporated by reference in their entireties:“Systems and Methods for Delivery of Peptides” (U.S. patent applicationSer. No. 13/801,402); “Treatment of Skin, Including Aging Skin, toImprove Appearance ”(U.S. patent application Ser. No. 13/801,446); “HairTreatment Systems and Methods Using Peptides and Other Compositions”(U.S. patent application Ser. No. 13/801,488); “Skin Tanning UsingPeptides and Other Compositions” (U.S. patent application Ser. No.13/801,518); “Topical Systems and Methods for Treating SexualDysfunction” (U.S. patent application Ser. No. 13/801,543); “ImmuneModulation Using Peptides and Other Compositions” (U.S. patentapplication Ser. No. 13/800,952); “Cardiovascular Disease Treatment andPrevention” (U.S. patent application Ser. No. 13/801,013); “WoundHealing Using Topical Systems and Methods” (U.S. patent application Ser.No. 13/801,061); “Peptide Systems and Methods for Metabolic Conditions”(U.S. patent application Ser. No. 13/801,110); “Methods and Systems forTreating or Preventing Cancer” (U.S. patent application Ser. No.13/801,188); “Compositions and Methods for Affecting Mood States” (U.S.patent application Ser. No. 13/081,240); “Improvement of Memory orLearning Using Peptide and Other Compositions” (U.S. patent applicationSer. No. 13/801,298); and “Brain and Neural Treatments ComprisingPeptides and Other Compositions” (U.S. patent application Ser. No.13/801,345).

The following examples are intended to illustrate certain embodiments ofthe present invention, but do not exemplify the full scope of theinvention.

EXAMPLE 1

This example illustrates one technique for preparing a composition inaccordance with one embodiment of the invention. An accurate amount of acarrier (HNC 167-62) (see below) was introduced into a system. Thecarrier weight used in these experiments was approximately 250 g and thevessel size was 500 ml. The vessel was equipped with a mechanicalstirrer, gas inlet, and gas outlet and was previously purged with argonfor about an hour. The temperature of the carrier was kept at about25-30° C. NO gas regulated at 5 psi (1 psi is about 6,900 Pa) and wasthen introduced at a controlled rate of about 1 bubble/s with continuousstirring. The color, consistency, and viscosity of the carrier did notappear to change if NO was bubbled for 30 minutes to 2 hours. After 6hours, the weight of the carrier had increased by 0.15%, by 12 hours by0.25%, and by 24 hours by 0.56%. These increases in weight were believedto be significant considering the relative small molecular weight of NOversus the carrier. Although there was a slight change in color duringthe experiment (the color changed to slightly more orange), IR spectrumanalysis of the final product did not show any change versus the initialcarrier, indicating no noticeable chemical change in the carrier. Thecarrier also can solidify upon cooling if the carrier is initially asolid at lower temperature. Accordingly, this example demonstrates thata composition containing NO can be prepared in accordance with oneembodiment of the invention.

EXAMPLE 2

In this example, six experiments were carried out to investigate theinteraction of nitric oxide with three carriers (HNC 157-62, HNC 157-65,and HNC 157-69) as well as with 1,3-propanediol, using experimentalconditions similar to that described for Example 1. In addition threeexperiments were performed to prepare carriers containing 800 ppm and500 ppm nitric oxide. HNC 157-62 was formed of 65% Phospholipon-90G(American Lecithin Company), 18% isopropyl palmitate (Kraft Chemicals),8% capric caprylic triglycerides (RITA Corp.), and 9% propanediol(Dupont). HNC 157-65 was formed of 65% Phospholipon-90G, 13% isopropylpalmitate, 14% capric caprylic triglycerides, 3% propanediol, and 5%dimethyl isosorbide (Croda). HNC 157-69 was formed from 65%Phospholipon-90G, 16% isopropyl palmitate, and 19% capric caprylictriglycerides.

The compositions were generally prepared as follows. Isopropylpalmitate, capric caprylic triglyceride, propanediol (for HNC 157-62 andHNC 157-65), and dimethyl isosorbide (for HNC 157-65) were mixedtogether and warmed to 40° C. Phospholipon-90G was then gradually addedto this liquid mixture by mixing it. Phospholipon-90G is typicallyreceived as individual pellets, and is mixed into the solution untilfully dissolved. The mixture was subsequently filtered through a sieveto remove any undissolved Phospholipon-90G.

Accordingly, the HNC carriers included 1,3-propanediol,Phospholipon-90G, isopropyl palmitate, capric and/or caporictriglycerides, and Arlasolve DMI (ICI America or Croda). Isopropylpalmitate, the capric and/or caporic triglycerides, and Arlasolve DMIare expected to be chemically inert towards nitric oxide, while theliterature suggests that 1,2-propanediol and glycerol may be able toreact with nitric oxide gas to form mononitrates. Accordingly, it wouldbe expected that 1,3-propanediol may also react with NO to formmononitrates:

In addition, Phospholipon-90G is derived from soybean and containsesters of unsaturated fatty acids such as oleic, linoleic, and linolenicacids, and thus, the unsaturated fatty acid part of Phospholipon-90Gwould react with nitric oxide to lead to a variety of nitrated products.

Each carrier was taken in a 500 mL three necked flask equipped with amechanical stirrer, gas inlet and a gas outlet. The system was purgedwith argon for one hour at room temperature (25° C.). Then nitric oxidegas was bubbled into the system. Then, nitric oxide gas was bubbledthrough carrier for stipulated amount of time. The changes in weight andcolor were noted. The details of individual experiments were as follows.

Experiment 1. The carrier was HNC 157-62. Nitric oxide gas was bubbledfor 24 hours at 25° C. The initial weight of carrier was 168.53 g., andthe final weight was 169.48 g. The net weight gained was 0.95 g and thepercentage weight gain was 0.56%.

Experiment 2. The carrier used was HNC 157-62. Nitric oxide gas wasbubbled for 48 hours at 25° C. The initial weight of carrier was 171.31g., and the final weight was 174.21 g. The net weight gained was 2.90 Gand the percentage weight gain was 1.69%.

Experiment 3. In order to differentiate between chemical reaction vs.physical absorption, the above reaction mixtures were heated at 55-60°C. for four hours. Minimal loss of weight was observed (˜200 mg),indicating no loss of absorbed nitric oxide gas. However, more intenseorange color developed during this process, indicating somedecomposition of the nitrites formed.

Experiment 4. The carrier used was HNC 157-65. Nitric oxide gas wasbubbled for 24 hours at 25° C. The initial weight of carrier was 171.66g., and the final weight was 172.98 g. The net weight gained was 1.32 gand percentage weight gain was 0.77%.

Experiment 5.

The carrier used was HNC 157-69 (same as HNC 157-62, except it had no1,3-propanediol). Nitric oxide gas was bubbled for 40 hours at 25° C.The initial weight of carrier was 171.02 g., and the final weight was171.97 g. The net weight gained was 0.95 g and the percentage weightgain was 0.56%.

Experiment 6. Nitric oxide gas was bubbled through 1,3-propanediol(neat) for 40 hours at 25° C. The initial weight of the 1,3-propanediolwas 178.81 g., and the final weight was 178.97 g. The net weight gainedwas 0.16 g and the percentage weight gain was 0.09%.

Experiment 7. For preparation of 800 ppm NO, the carrier used was HNC157-62. Nitric oxide gas was bubbled for 2 hours at 25° C. The initialweight of carrier was 238.16 g., and the final weight was 238.35 g. Thenet weight gained was 0.19 g and the percentage weight gain 0.0798%(˜800 ppm). See entry 5 in Table 1.

Experiment 8. For preparation of 500 ppm NO, the carrier used was HNC157-65. Nitric oxide gas was bubbled for 2 hours at 25° C. The initialweight of carrier was 250.37 g., and the final weight was 250.50 g. Thenet weight gained was 0.13 g and the percentage weight gain was 0.0519%(˜500 ppm). See entry 6 in Table 1.

Experiment 9. For preparation of 800 ppm NO, the carrier used was HNC157-62. Nitric oxide gas was bubbled for 15 min at 25° C. The initialweight of carrier was 252.24 g., and the final weight was 252.45 g. Thenet weight gained was 0.21 g and the percentage weight gain 0.083% (˜800ppm).

These experiments were conducted with carriers the HNC 157-62, HNC157-65, HNC 157-69, and 1,3-propanediol.

As described above and in Table 1, weight gains ranging from 0.5% to1.7% were observed when nitric oxide gas was passed through thecarriers. In order to determine the nature of interaction between nitricoxide and carrier, the carrier was heated after nitric oxide absorptionat 60° C. for four hours. Practically no loss of weight was observed,which indicated that the nitric oxide gas reacted chemically with thecarriers (entries 1-4 in Table 1).

In order to investigate the reactivity of 1,3-propanediol with nitricoxide, nitric oxide absorption was studied using (a) HNC 157-69, whichdid not contain 1,3-propanediol, and (b) 1,3-propanediol by itself. HNC157-69 gained 0.95 g or 0.56% weight, much lower compared to its1,3-propanediol containing analog HNC 157-62, which showed 1.69% weightgain (entries 2 and 5 of Table 1). 1,3-propanediol itself, surprisingly,showed only negligible, if any, weight gain when NO was passed throughit (entry 6 in Table 1). Thus, under experimental conditions,1,3-propanediol did not react with nitric oxide.

Two samples were also prepared containing 800 ppm NO (from carrier HNC157-62) and one sample containing 500 ppm NO (from carrier HNC 157-65)(entries 7-9 in Table 1). The IR spectra of the carriers did not showany additional bands after the reaction, possibly because of low amountsof nitrites and/or overlap with the carrier complex bands.

Mass spectral studies of the carrier HNC 157-62 and HNC 157-62containing NO indicated that there was an increase in the intensity ofthe peak at m/e 104 in NO-containing carrier, compared to carrierwithout NO. The peak at m/e 104 was believed to be due to choline cation(C₅H₁₄NO). Phospholipon-90G may contain some free choline, and hencepresence of the peak at 104 in the mass spectrum of the carrier was notsurprising. However, the increase in the amount of choline after passageof NO was somewhat unexpected, although it is believed that nitric oxidecatalyzes similar dephosphorylation of Phospholipon-90G releasingcholine.

In conclusion, an increase in weight (0.56 to 1.69%) was observed whennitric oxide gas was passed through the carriers. 1,3-propanediol failedto gain any significant weight when nitric oxide was passed through it.HNC 157-69 (devoid of 1,3-propanediol) gained only 0.56% weight comparedto 1.69% by its 1,3-propanediol containing analog HNC 157-62. The massspectra of HNC 157-62 before and after passing NO indicated that thepeak corresponding to choline at m/e 104 increased after the passage ofNO, which suggests that phospholipon-90G may undergo NO-catalyzeddephosphorylation.

TABLE 1 Initial wt. Final wt. Time Temp. % Wt. Expt. No. Carrier g. g.hr ° C. Wt. Gain g gain 1 HNC 157- 168.53 169.48 24 25 0.95 0.56 62 2HNC 171.31 174.21 48 25 2.90 1.69 157-62 3 HNC 174.21* 174.01 4 60 −0.20−0.11 157-62 4 HNC 171.66 172.98 24 25 1.32 0.77 157-65 5 HNC 171.02171.97 40 25 0.95 0.56 157-69 6 1,3- 178.81 178.97 40 25 0.16 0.09Propanediol 7 HNC 238.16 238.35 2 25 0.19 0.0798 157-62 (~800 ppm) 8 HNC250.37 250.50 2 25 0.13 0.0519 157-65 (~500 ppm) 9 HNC 252.24 252.450.25 25 0.21 0.0833 157-62 (~800 ppm)

EXAMPLE 3

This example illustrates non-invasive blood pressure measurements inmice using a composition in accordance with one embodiment of theinvention.

Blood pressure in mice may be measured using blood volume changes in themouse tail. Mice with normal tails (no clipping or short) were used inthis study. Ages varied between 8 weeks and 24 weeks. This procedureuses the CODA non-invasive blood pressure system available from KentScientific (Torrington, Conn.) Mice weighing approximately 25 grams wererestrained in plastic cylindrical housing with a nose come allowing thenose to protrude. Two tail cuffs provided occlusion and measurements.The O-cuff provided period occlusion while the VPR cuff providesvolume-pressure recordings. The occlusion pressure and the recordedpressure were controlled automatically by the computer software.

Each measurement had 10 acclimation cycles and 20 measurement cyclesonce daily depending on the experimental parameters. The average bloodpressure of male mice made over time was 136/88. In this study, bloodpressure measurements of the control (base) mice and the test (treated)mice were made and averaged over a period of three days. The testcomposition comprised 800 ppm nitric oxide, which was applied over theupper back of the animal in a quantity that exceeded 50 mg. The bloodpressures were recorded after each application and over 1 hour. Thefollowing results were obtained.

TABLE 2 Average Blood Pressure Reading Post Application Control (Base)Product Test (Treated) NO 800 ppm Time 0 167/123 140/91 1 Hour 170/128115/69This study shows that the application of the test product is capable ofreducing the blood pressure in a mouse to a significantly lower value.

EXAMPLE 4

This example illustrates capillary blood flow measurements in humansusing a composition similar to the ones described in the above examples.

Microcirculation properties of the skin were measured before and afterapplication of a test product with nitric oxide. Measurements were madeusing a Moor® Laser Doppler instrument. Measurements were made at Day 1before and immediately, 5 and 15 minutes after treatment.

The study participants were healthy females aged 30 to 55 years. Theywere in good health as determined by the medical history and were nottaking any prescription medications. The test product was labeled as 800ppm NO (nitric oxide). The study participants had 100 mg of the testproduct applied in a 2×2 sq. inch area on the forearm.

Laser Doppler was performed to measure increased stimulation of themicro-capillary blood flow to skin. The micro-circulation of the skinreflects the perfusion of the skin and the underlying tissue. The laserDoppler technique is the standard method to obtain dynamic measurementof capillary blood flow in clinical evaluation. Measurements can be maderelatively rapidly and simultaneously at sites. In addition, temperaturemeasurements may also be made at the same time.

A Moor Instruments DRT4 Laser Doppler Blood Flow Monitor (Devon,England) was used. The laser Doppler technique measures blood flow inthe microcapillaries of the skin that are close to the skin surface andthe blood flow in underlying arterioles and venules that help toregulate skin temperature. There are several parameter used to describeblood flow measured by this laser Doppler technique. These measurementparameters are defined by Moor Instruments Inc. and are listed below.

Flux: This parameter is related to the product of average speed andconcentration of moving red blood cells in the tissue sample volume. Itis the parameter most widely reported in Laser Doppler publication.

Conc: This parameter gives an indication of the number of moving redblood cells in the tissue sample volume.

Speed: This parameter gives an indication of the average speed of redblood cells moving in the tissue sample volume.

Temp: This is the probe temperature and where there is good thermalconduction between probe and tissue it reaches tissue temperature.

Because of the nature of blood flow in the capillaries and other smallblood vessels, absolute flow units such as ml/minute cannot beexpressed. Therefore, arbitrary units are used. Blood flow changes aredefined as the percentage change from the baseline of these arbitraryunits.

The procedure was as follows. The laser Doppler probe was attached ontothe volar forearm. Control untreated skin readings (Baseline) wereobtained for 15 minutes. The test product was then applied in thedesignated 2×2 sq. inch area and rubbed into the skin. Readings wereobtained for 15 minutes.

The areas not used for evaluation include the first 15 seconds afterstarting data collection. Four 10 second areas in the baseline and testreadings at each time point were randomly selected to obtain the meanaverages which were then used in further analysis of the data.

The averaged data was compiled from the 4 study participants and thelaser Doppler results are provided in FIG. 1. There was a significantdifference observed in the control untreated skin and the skin treatedwith 800 ppm nitric oxide up to 15 minutes after application. Theapplied nitric oxide had an effect on the micro circulation of the skinat the applied level (100 mg in a 2×2 sq. inch area). The topical testproduct is capable of passing through the skin and affecting themicrocirculation of the skin.

EXAMPLE 5

This example illustrates delivery of nitric oxide formulations similarto those discussed herein in humans. In these studies, laser Dopplerstudies were performed on three human female subjects. As discussedbelow, all of the studies showed positive results consistent with aphysiological effect of nitric oxide applied to the skin, passingthrough the skin and affecting the capillary circulation. Theformulations used produce positive, almost immediate results whenapplied to the skin which, in these studies, was manifested byvasodilatation of the cutaneous vascular system.

While nitric oxide has many physiological effects, the purpose of thesestudies was to measure physiological effects that would be relativelyeasy to determine, and which would be noninvasive. Laser Doppler wasselected for these studies because laser Doppler has a relatively largedatabase that indicates that it is effective in determining an increasein microcirculation, i.e., circulation within the capillary bedimmediately under the epidermal layer in the skin. Nitric oxide iscapable of violating the capillary bed, and thus, laser Doppler wasselected.

The formulation used in these studies contained nitric oxide dispersedin a lipid matrix. The nitric oxide was dispersed in the matrix and doesnot appear to be dissolved but remained intact, i.e., it appeared todiffuse into the skin as a molecule of nitric oxide rather than asatomic components or ions. Nitric oxide is a very rapid acting molecule,and these studies used a system that employed laser Doppler with acovered chamber. The formulation was placed into the chamber and thenattached to the skin by an adhesive layer on the covering. This provideda stable measuring device as determined by multiple normal evaluationsof the capillary blood flow without treatment of nitric oxide.

A known positive control, methyl nicotinate, was applied to the skin ata concentration of 1/10% in alcohol. There was a rapid response typicalof the vasodilator. The vascular dynamics are such that when the bloodvessels dilate physical parameters follow Bernoulli's law. This statesthat as one increases the diameter of a tube containing a liquid to flowwill increase but the pressure and the speed of the liquid willdecrease. The laser Doppler device accurately measured these parameters.

When nitric oxide was applied to the forearm of three human femalesubjects, it was observed that there was an immediate effect on theblood flow as soon as the formulation was applied. The speed of bloodflow decreased, and the effects lasted over 15 minutes. There was noerythema and no discomfort to the subjects that was observed.

Thus, these studies showed that the nitric oxide in the lipid matrixwhen applied topically to the forearm, was able to penetrate the skinvery rapidly and to interact with the underlying tissues. This isevidenced by the observation of vascular dilatation without erythema.Accordingly, it can be concluded from these studies that the formulationcontaining nitric oxide was effective in delivering nitric oxide throughthe skin in a physiologically active state.

In these studies, the participants were healthy females aged 30 to 55years. They were in good health as determined by the medical history andwere not taking any prescription medications. All study participantsread and signed the informed consent statement prior to any studyprocedures being performed.

The test product was labeled as 10,000 ppm NO (nitric oxide). The studyparticipants had 100 mg of the test product applied in a closed Hilltopchamber on the forearm.

Laser Doppler was performed to measure increased stimulation of themicro-capillary blood flow to skin. The micro-circulation of the skinreflected the perfusion of the skin and the underlying tissue. LaserDoppler is a standard method to obtain dynamic measurement of capillaryblood flow in clinical evaluation. Measurements can be made relativelyrapidly and simultaneously at sites. In addition, temperaturemeasurements may also be made at the same time.

A Moor Instruments DRT4 Laser Doppler Blood Flow Monitor (Devon,England) was used in these studies. The laser Doppler technique measuredblood flow in the microcapillaries of the skin that are close to theskin surface and the blood flow in underlying arterioles and venulesthat help to regulate skin temperature. Because of the nature of bloodflow in the capillaries and other small blood vessels, it is difficultto detremine absolute flow units such as ml/minute. Therefore, arbitraryunits were used in these experiments to determine relative changes.Blood flow changes were accordingly defined as the percentage changefrom the baseline using the arbitrary units.

Data was compiled from the three study participants and the laserDoppler studies and averaged. It observed that there was a significantdifference observed in the control untreated skin and the skin treatedwith 10,000 ppm nitric oxide up to 15 minutes after application. Theapplied nitric oxide had an effect on the microcirculation of the skinat the applied level (100 mg in a lipid matrix). The formulation wasdetermined to be capable of passing through the skin and affecting themicrocirculation of the skin.

EXAMPLE 6

This example illustrates a protocol used for determining the amount ofnitric oxide released from various compositions of the presentinvention. The protocol is generally performed as follows:

1) Samples (within HNC carriers described herein) were maintained ateither 4° C. or −20° C. until analyzed.

2) One at a time and before they were opened, samples were warmed to 37°C. (dry bath) in a controlled atmosphere of 1% O₂. They were opened and150 microliters was removed and placed into 1.35 mL of PBS (pH 7.4, 25°C. and equilibrated to 13 micromolar O₂) in a small glass screw-cap vialminimizing headspace.

3) The vials were then subjected to 15 s of vortex agitation, capsopened and 1 mL quickly removed and immediately injected into a SieversNitric Oxide Analyzer reaction chamber containing 4 mL of deionized anddistilled H₂O equilibrated at 0% O₂ by a N₂ flow through gas andmaintained at 37° C. by flow-through water jacket.

4) Peaks were analyzed by comparing values to a standard curve generatedby injecting various concentrations of the NO donor1-(hydroxy-NNO-azoxy)-L-proline (PROLI-NONOate). To standardize amongsamples, the area under the curve from 0 to 4 min was used forconcentration determinations are expressed in moles of NO and have beencorrected for the 2 dilutions (50×). As such, these values equal molesof NO/150 microliter matrix.

5) The authenticity of NO formation was validated by injecting 50 mM ofthe NO spin trap2-(4-carboxyphenyl)-4,5-dihydro-4,4,5,5-tetramethyl-1H-imidazolyl-1-oxy-3-oxide(cPTIO) or by injecting sample into the reaction chamber containing 50mM cPTIO and observing the absence of signal.

6) For each sample, the area under the curve from t=0 to t=4 min wascalculated for concentration determinations. Calculations represent onlythe amount of NO released during this 4 min time span and thus do notrepresent the total amount of NO contained in the volume of matrixassessed (150 microliters). For each vial 3-5 independent determinationswere performed (this means each injection represents removal of 150microliters of matrix from the labeled vial, dilution in PBS andinjection. As such, these were completely independent measurements frombeginning to end.

TABLE 3 Sample ID Mean (millimoles NO) Std Dev 1000 11.4 1.55 4000 60.71.70 7000 72.1 11.9 10000 127.9 11.3In this table, the Sample ID numbers correspond to the amount of nitricoxide, in ppm, that was formulated in the composition (sample) tested.

Based on these results, the compositions tested here appeared to beeffective in entrapping nitric oxide gas, and are effective in releasingthe trapped gas in a measureable and significant way.

EXAMPLE 7

This example illustrates techniques for preparing compositions inaccordance with one or more embodiments of the invention. Specifically,four formulations suitable as peptide and nitric oxide carriers areprovided: two four-phase formulations (HNC 156-43, HNC 156-50), and twosingle-phase formulations (HNC 156-47, HNC 159-136).

HNC 156-43

This formulation was formed of: 77.7% water, 6.0% Phospholipon-90G(American Lecithin Company), 0.10% EDTA-Na₂ (Sigma), 0.1% citric acid,5.0% isopropyl palmitate (IPP, Kraft Chemicals), 5.0% Promulgen-D(Lubrizol), 3.0% Arlacel-165 (Croda), 1.0% cetearyl alchohol 50/50, 0.5%Dow Corning Fluid 200-10 CST, 0.1% Tocotrienol-50C (Carotech), 0.5%Optiphen Plus (Lotioncrafter), and 1.0% Seppitonic M3 (Seppic).

The individual ingredients were divided between four phases as follows:

Phase 1: water, Phospholipon-90G, EDTA-Na₂, citric acid.

Phase 2: IPP, Promulgen-D, Arlacel-165, cetearyl alchohol 50/50, DowCorning Fluid 200-10 CST, Tocotrienol-50C.

Phase 3: Optiphen Plus.

Phase 4: Seppitonic M3.

HNC 156-50

This formulation was formed of: 78.3% water, 10.0% Phospholipon-90G(American Lecithin Company), 0.10% EDTA-Na₂ (Sigma), 0.2% sodiumhyaluronate (1% solution), 3.0% isopropyl palmitate (IPP, KraftChemicals), 3.0% Promulgen-D (Lubrizol), 4.0% Arlacel-165 (Croda), 0.7%cetearyl alchohol 50/50, 0.5% Optiphen Plus (Lotioncrafter), and 0.2%dimethylethanolamine (DMAE, Sigma).

The individual ingredients were divided between four phases as follows:

Phase 1: water, Phospholipon-90G, EDTA-Na₂, sodium hyaluronate.

Phase 2: IPP, Promulgen-D, Arlacel-165, cetearyl alchohol 50/50.

Phase 3: Optiphen Plus.

Phase 4: DMAE.

The four-phase compositions were generally prepared as follows: Phases 1and 2 were heated to 60° C., added and mixed together, then allowed tocool to 48° C., at which point Phase 3 was added and mixed. The mixturewas then allowed to cool to 38° C., at which point phase 4 was added andmixed.

HNC 156-47

This formulation was formed of: 47% water, 5.0% PEG-200 (Sigma), 45%Phospholipon-90G (American Lecithin Company), 1.0% benzyl alcohol, and2.0% ethyl alcohol.

HNC 159-136

This formulation was formed of: 65% Phospholipon-90G (American LecithinCompany), 18.0% isopropyl palmitate (IPP, Kraft Chemicals), 8% capriccaprylic triglycerides (RITA Corp.), and 9% propanediol (Dupont).

Any of the above compositions are effective as carriers for peptides andnitric oxide. For example, the TRH peptide was shown to be effectivelycarried by each of the above formulations at a TRH concentration of 5.0mg/cc.

EXAMPLE 8

This example illustrates delivery of nitric oxide formulations to fivehuman subjects, using procedures and formulations similar to thosediscussed in Example 5. Each person served as their own control for thetesting. A Moor Instruments Laser Doppler was used to determinecirculation. All of these studies showed positive results consistentwith a physiological effect of nitric oxide applied to the skin, passingthrough the skin and affecting the capillary circulation. Theformulations used produce positive, almost immediate results whenapplied to the skin which, in these studies, was manifested byvasodilatation of the cutaneous vascular system.

For each subject, the following creams were applied: a negative controlformulation (containing no NO), 0.010 gram of a 10,000 ppm NOformulation, 0.020 gram of a 10,000 ppm NO formulation, and a positivecontrol formulation containing 0.1% methyl nicotinate. The formulationswere prepared using procedures similar to those discussed in Example 1.

When nitric oxide was applied to the forearm of the subjects, it wasobserved that there was an immediate effect on the blood flow as soon asthe formulation was applied. The speed of blood flow decreased, and theeffects lasted over 15 minutes. There was no erythema and no discomfortto the subjects that was observed.

Data was compiled from the study participants and the laser Dopplerstudies and averaged. It observed that there was a significantdifference observed in the control untreated skin (where no detectablevasodilation was observed), and the treatments involving 0.010 g of NO,0.020 g of NO, and methyl nicotinate. For all three treatments,vasodilatation was observed, with somewhat greater vasodilatation forthe 0.010 g formulation over the 0.02 g formulation. In addition, theamount of vasodilatation observed for the 0.01 g formulation of NO wasgenerally similar to the amount of vasodilatation observed for methylnicotinate.

Accordingly, these data demonstrate that NO as applied in a cream to theskin is able to penetrate the skin and affect bloodflow beneath theskin.

While several embodiments of the present invention have been describedand illustrated herein, those of ordinary skill in the art will readilyenvision a variety of other means and/or structures for performing thefunctions and/or obtaining the results and/or one or more of theadvantages described herein, and each of such variations and/ormodifications is deemed to be within the scope of the present invention.More generally, those skilled in the art will readily appreciate thatall parameters, dimensions, materials, and configurations describedherein are meant to be exemplary and that the actual parameters,dimensions, materials, and/or configurations will depend upon thespecific application or applications for which the teachings of thepresent invention is/are used. Those skilled in the art will recognize,or be able to ascertain using no more than routine experimentation, manyequivalents to the specific embodiments of the invention describedherein. It is, therefore, to be understood that the foregoingembodiments are presented by way of example only and that, within thescope of the appended claims and equivalents thereto, the invention maybe practiced otherwise than as specifically described and claimed. Thepresent invention is directed to each individual feature, system,article, material, kit, and/or method described herein. In addition, anycombination of two or more such features, systems, articles, materials,kits, and/or methods, if such features, systems, articles, materials,kits, and/or methods are not mutually inconsistent, is included withinthe scope of the present invention.

All definitions, as defined and used herein, should be understood tocontrol over dictionary definitions, definitions in documentsincorporated by reference, and/or ordinary meanings of the definedterms.

The indefinite articles “a” and “an,” as used herein in thespecification and in the claims, unless clearly indicated to thecontrary, should be understood to mean “at least one.”

The phrase “and/or,” as used herein in the specification and in theclaims, should be understood to mean “either or both” of the elements soconjoined, i.e., elements that are conjunctively present in some casesand disjunctively present in other cases. Multiple elements listed with“and/or” should be construed in the same fashion, i.e., “one or more” ofthe elements so conjoined. Other elements may optionally be presentother than the elements specifically identified by the “and/or” clause,whether related or unrelated to those elements specifically identified.Thus, as a non-limiting example, a reference to “A and/or B”, when usedin conjunction with open-ended language such as “comprising” can refer,in one embodiment, to A only (optionally including elements other thanB); in another embodiment, to B only (optionally including elementsother than A); in yet another embodiment, to both A and B (optionallyincluding other elements); etc.

As used herein in the specification and in the claims, “or” should beunderstood to have the same meaning as “and/or” as defined above. Forexample, when separating items in a list, “or” or “and/or” shall beinterpreted as being inclusive, i.e., the inclusion of at least one, butalso including more than one, of a number or list of elements, and,optionally, additional unlisted items. Only terms clearly indicated tothe contrary, such as “only one of” or “exactly one of,” or, when usedin the claims, “consisting of,” will refer to the inclusion of exactlyone element of a number or list of elements. In general, the term “or”as used herein shall only be interpreted as indicating exclusivealternatives (i.e. “one or the other but not both”) when preceded byterms of exclusivity, such as “either,” “one of,” “only one of,” or“exactly one of.” “Consisting essentially of,” when used in the claims,shall have its ordinary meaning as used in the field of patent law.

As used herein in the specification and in the claims, the phrase “atleast one,” in reference to a list of one or more elements, should beunderstood to mean at least one element selected from any one or more ofthe elements in the list of elements, but not necessarily including atleast one of each and every element specifically listed within the listof elements and not excluding any combinations of elements in the listof elements. This definition also allows that elements may optionally bepresent other than the elements specifically identified within the listof elements to which the phrase “at least one” refers, whether relatedor unrelated to those elements specifically identified. Thus, as anon-limiting example, “at least one of A and B” (or, equivalently, “atleast one of A or B,” or, equivalently “at least one of A and/or B”) canrefer, in one embodiment, to at least one, optionally including morethan one, A, with no B present (and optionally including elements otherthan B); in another embodiment, to at least one, optionally includingmore than one, B, with no A present (and optionally including elementsother than A); in yet another embodiment, to at least one, optionallyincluding more than one, A, and at least one, optionally including morethan one, B (and optionally including other elements); etc.

It should also be understood that, unless clearly indicated to thecontrary, in any methods claimed herein that include more than one stepor act, the order of the steps or acts of the method is not necessarilylimited to the order in which the steps or acts of the method arerecited.

In the claims, as well as in the specification above, all transitionalphrases such as “comprising,” “including,” “carrying,” “having,”“containing,” “involving,” “holding,” “composed of,” and the like are tobe understood to be open-ended, i.e., to mean including but not limitedto. Only the transitional phrases “consisting of” and “consistingessentially of” shall be closed or semi-closed transitional phrases,respectively, as set forth in the United States Patent Office Manual ofPatent Examining Procedures, Section 2111.03.

What is claimed is:
 1. A method of improving skin appearance,comprising: administering, to the skin of a subject, a compositioncomprising an effective amount of gonadotropin-releasing hormone (GnRH)and molecular nitric oxide to improve skin appearance, and a carrierhaving a phosphatidylcholine component entrapping the nitric oxide,wherein the composition is stable at room temperature.
 2. The method ofclaim 1, wherein the skin of the subject is aging skin.
 3. The method ofclaim 1, wherein the skin of the subject is wrinkled.
 4. The method ofclaim 1, wherein the skin has been damaged due to exposure toultraviolet light.
 5. The method of claim 1, wherein the skin issunburned skin.
 6. The method of claim 1, wherein the compositionfurther comprises thyrotropin-releasing hormone (TRH).
 7. The method ofclaim 1, wherein the molecular nitric oxide is present within thecarrier as a gas or bound by hydrogen bonds or van der Waals forces. 8.The method of claim 1, wherein the phosphatidylcholine carrierstabilizes the nitric oxide at a temperature at or lower than 80° C. 9.A method of improving skin appearance, comprising contacting the skin ofa subject with a composition comprising: an emulsion comprising a firstphase comprising gonadotropin-releasing hormone (GnRH), molecular nitricoxide and lecithin, and a second phase comprising an emulsifier, whereinthe lecithin is present at least about 0.25% by weight of thecomposition, and wherein the first phase comprises no more than about250 ppm of water by weight of the composition.
 10. The method of claim9, wherein the skin of the subject is aging skin.
 11. The method ofclaim 9, wherein the first phase further comprises thyrotropin-releasinghormone (TRH).
 12. The method of claim 9, wherein the molecular nitricoxide is present within the emulsion as a gas or bound by hydrogen bondsor van der Waals forces to the lecithin.
 13. The method of claim 9,wherein the nitric oxide is present at least about 0.5% by weight of thecomposition without nitric oxide.
 14. The method of claim 9, wherein atleast some of the nitric oxide is present within the first phase boundto phosphatidylcholine.
 15. The method of claim 9, wherein the lecithincomprises a phosphatidylcholine.
 16. The method of claim 15, wherein atleast some of the phosphatidylcholine comprises apolyenylphosphatidylcholine.
 17. The method of claim 9, wherein thefirst phase comprises a fatty acid ester.
 18. A method, comprising:administering, topically to the skin of a subject, a compositioncomprising an emulsion comprising a first phase comprising an effectiveamount of gonadotropin-releasing hormone (GnRH), lecithin and molecularnitric oxide to improve skin appearance, and a second phase comprisingan emulsifier, wherein the composition comprises no more than about 250ppm of water by weight of the composition.